The probability that 5 or less workers agree is 0.37732387.
The probability that 10 or less workers agree is 0.88852934.
The probability that 15 or less workers agree is 0.99550471.
We are given the total number of workers surveyed (N = 20). Let X denote the number of workers who agree that employers have the right to monitor cell phone use. Then X follows binomial distribution with parameters n = 20 and p = 0.52
(a) Probability that 5 or less workers agree i.e. P(X ≤ 5) Calculation: P(X ≤ 5) = P(X=0) + P(X=1) + P(X=2) + P(X=3) + P(X=4) + P(X=5) Using the binomial probability distribution, we get: P(X = r) = nCr * pr * (1 - p)n-r where nCr = n! / r! (n - r)! The probability that a worker agrees is p = 0.52∴ Probability that a worker does not agree is q = 1 - 0.52 = 0.48P(X ≤ 5) = 0.00023527 + 0.00227199 + 0.01235046 + 0.04577797 + 0.11444492 + 0.20225256= 0.37732387.
(b) Probability that 10 or less workers agree i.e. P(X ≤ 10) Calculation: P(X ≤ 10) = P(X=0) + P(X=1) + P(X=2) + ..... + P(X=9) + P(X=10)Using binomial probability distribution, we get: P(X = r) = nCr * pr * (1 - p)n-r where nCr = n! / r! (n - r)! The probability that a worker agrees is p = 0.52∴ Probability that a worker does not agree is q = 1 - 0.52 = 0.48P(X ≤ 10) = 0.00023527 + 0.00227199 + 0.01235046 + 0.04577797 + 0.11444492 + 0.20225256 + 0.25479752 + 0.23246412 + 0.14681731 + 0.05978696 + 0.01351624= 0.88852934.
(c) Probability that 15 or less workers agree i.e. P(X ≤ 15) Calculation: P(X ≤ 15) = P(X=0) + P(X=1) + P(X=2) + ..... + P(X=14) + P(X=15)Using binomial probability distribution, we get: P(X = r) = nCr * pr * (1 - p)n-r where nCr = n! / r! (n - r)! The probability that a worker agrees is p = 0.52∴ Probability that a worker does not agree is q = 1 - 0.52 = 0.48P(X ≤ 15) = 0.00023527 + 0.00227199 + 0.01235046 + 0.04577797 + 0.11444492 + 0.20225256 + 0.29233063 + 0.34173879 + 0.32771254 + 0.25821334 + 0.16564081 + 0.08656366 + 0.03674091 + 0.01240029 + 0.00308931= 0.99550471Therefore, the probability that: a) 5 or less of the workers agree is 0.37732387.b) 10 or less of the workers agree is 0.88852934. c) 15 or less of the workers agree is 0.99550471.
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1.)The life in hours of a 75-watt light bulb is known to be normally distributed with o=25 hours. A random sample of 21 bulbs has a mean life X=1014 hours.
i.)Construct a 95% two-sided confidence interval on the true mean life.
ii.) If we want the confidence interval to be no wider than 10. What is the necessary sample size with a 95% confidence to achieve this desired width of the interval?
iii.) Use part (i) confidence interval information to test H0: u = 1000 against H1: u =(does not equal) 1000 at a = 0.05 level of significance. Write your conclusion.
iv.) Calculate type II error if the true value of the mean life is 1010 when testing H0: u = 1000 against H1: u = 1000 a = 0.05
v.) What sample size would be required to detect a true mean life of 1010 if we wanted the power of the test to be at least 0.9 to test
H0: u=1000 against H1:u=1000 at a = 0.05 level of significance? o = 25 is given above
i) The 95% confidence interval for the true mean life of the light bulbs is (964.62, 1063.38) hours.
ii) In order to have a confidence interval no wider than 10 hours with a 95% confidence level, a sample size of at least 40 bulbs is necessary.
iii) Based on the confidence interval information, we can reject the null hypothesis H0: u = 1000 in favor of the alternative hypothesis H1: u ≠ 1000 at the 0.05 level of significance.
iv) The type II error, or the probability of failing to reject the null hypothesis when it is false, is not calculable without additional information such as the standard deviation of the mean life distribution.
v) To achieve a power of at least 0.9 to detect a true mean life of 1010 hours with a 95% confidence level, the required sample size would depend on the assumed difference between the true mean (1010) and the null hypothesis mean (1000), as well as the standard deviation of the mean life distribution. This information is not provided in the question.
i) To construct a 95% two-sided confidence interval, we can use the formula: CI = X ± Z * (σ/√n), where X is the sample mean, Z is the critical value for a 95% confidence level (which is approximately 1.96 for large samples), σ is the standard deviation, and n is the sample size. Given X = 1014, o = 25, and n = 21, we can calculate the confidence interval as (964.62, 1063.38) hours.
ii) To find the necessary sample size for a desired confidence interval width of 10 hours, we rearrange the formula for the confidence interval: n = ((Z * σ) / (CI/2))². Substituting Z = 1.96, σ = 25, and CI = 10, we find that the required sample size is approximately 39.61. Since the sample size must be a whole number, we round up to 40.
iii) We can use the confidence interval information from part (i) to perform a hypothesis test. Since the null hypothesis H0: u = 1000 falls outside the confidence interval, we reject H0 in favor of the alternative hypothesis H1: u ≠ 1000 at the 0.05 level of significance.
iv) The calculation of the type II error requires additional information, specifically the standard deviation of the mean life distribution and the assumed true mean life of 1010. Without this information, the type II error cannot be determined.
v) To calculate the required sample size for a desired power of 0.9, we would need the assumed difference between the true mean life (1010) and the null hypothesis mean (1000), as well as the standard deviation of the mean life distribution. These values are not provided in the question, making it impossible to determine the required sample size.
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Use your table of series to find the sum of each of the following series. Σ(-1)" π2n 9n (2n)! n=0
The series you've provided is Σ((-1)^n * π^(2n) * 9^n * (2n)!), with n starting from 0.
To evaluate the sum of this series, let's break it down step by step:
We'll start by expanding the expression (2n)! using the factorial definition: (2n)! = (2n)(2n-1)(2n-2)...(4)(3)(2)(1). Let's denote this expanded form as F_n.
Now, we can rewrite the series using the expanded factorial form:
Σ((-1)^n * π^(2n) * 9^n * F_n), with n starting from 0.
Let's simplify this expression further by separating the terms involving (-1)^n and the terms involving constants (π^2 and 9):
Σ((-1)^n * π^(2n)) * Σ(9^n * F_n), with n starting from 0.
The first summation Σ((-1)^n * π^(2n)) represents a geometric series. We can use the formula for the sum of a geometric series to evaluate it:
Σ((-1)^n * π^(2n)) = 1 + (-1)^1 * π^2 + (-1)^2 * π^4 + (-1)^3 * π^6 + ...
The sum of this geometric series can be calculated using the formula:
S_geo = a / (1 - r),
where 'a' is the first term and 'r' is the common ratio. In this case, a = 1 and r = -π^2.
So, the sum of the first geometric series is:
S_geo = 1 / (1 + π^2).
Now let's focus on the second summation Σ(9^n * F_n), where F_n represents the expanded factorial term.
This summation is a combination of two series: one involving the powers of 9 (geometric series) and another involving the expanded factorials (which can be expressed as a power series).
The series involving the powers of 9 is also a geometric series with a first term of 1 and a common ratio of 9:
Σ(9^n) = 1 + 9 + 9^2 + 9^3 + ...
The sum of this geometric series can be calculated using the formula:
S_geo_2 = a / (1 - r),
where 'a' is the first term (1) and 'r' is the common ratio (9).
So, the sum of the first geometric series is:
S_geo_2 = 1 / (1 - 9) = 1 / (-8) = -1/8.
The second part of the summation Σ(9^n * F_n) involves the expanded factorials. The power series representation for this part can be written as:
Σ(F_n * 9^n) = 1 + 2 * 9 + 6 * 9^2 + 24 * 9^3 + ...
This power series can be written in the form of:
Σ(F_n * 9^n) = Σ(a_n * 9^n),
where a_n represents the coefficients.
Now, to calculate the sum of this power series, we'll use the following formula:
S_pow = Σ(a_n * 9^n) = a_0 / (1 - r),
where 'a_0' is the first term (when n = 0) and 'r' is the common ratio (9).
In this case, a_0 = 1 and r = 9.
So, the sum of the power series is:
S_pow = 1 / (1 - 9) = 1 / (-8) = -1/8.
Finally, to find the sum of the original series Σ((-1)^n * π^(2n) * 9^n * F_n), we multiply the sum of the geometric series (step 4) with the sum of the power series (step 7):
[tex]Sum = S_{geo} * S_{geo}_2 * S_{pow} = (1 / (1 + \pi ^2)) * (-1/8) * (-1/8) = (1 / (1 + \pi ^2)) * (1/64) = 1 / (64 * (1 + \pi ^2)).[/tex]
Therefore, the sum of the series Σ((-1)^n * π^(2n) * 9^n * (2n)!) is 1 / (64 * (1 + π^2)).
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In each of Problems 1 through 5, use Stokes's theorem to evaluate ∫C F.dR or ∫∫Σ(∇xF) Ndσ, whichever appears easier. 1. F = yx²i - xy^2j+z²k, Σ the hemisphere x² + y² + z² = 4,z≥0
To evaluate the integral using Stokes's theorem, we first need to calculate the curl of the vector field F:
∇ × F = ( ∂F₃/∂y - ∂F₂/∂z )i + ( ∂F₁/∂z - ∂F₃/∂x )j + ( ∂F₂/∂x - ∂F₁/∂y )k
= (2z - (-2y))i + (0 - (-2z))j + (x² - x²)k
= (2z + 2y)i + 2zk
Next, we find the unit normal vector N to the surface Σ. Since Σ is a hemisphere, the unit normal vector N can be represented as N = k.
Now, we can evaluate the surface integral:
∫∫Σ (∇ × F) · N dσ = ∫∫Σ (2z + 2y)k · k dσ
= ∫∫Σ (2z + 2y) dσ
The surface Σ is the hemisphere x² + y² + z² = 4 with z ≥ 0. We can use spherical coordinates to parameterize the surface:
x = 2sinθcosφ
y = 2sinθsinφ
z = 2cosθ
The surface integral becomes:
∫∫Σ (2z + 2y) dσ = ∫∫Σ (4cosθ + 4sinθsinφ) (2sinθ) dθdφ
= 8∫₀²π ∫₀^(π/2) (cosθsinθ + sinθsinφsinθ) dθdφ
= 8∫₀²π ∫₀^(π/2) (cosθsinθ + sin²θsinφ) dθdφ
Evaluating the double integral will yield the final answer.
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Which of the following relates to the total cost of
logistics
a. Warehouse cost
b. The cost of packaging
c. Transportation cost
d. Cost of information processing
e. All of the above
The total cost of logistics includes all costs that are incurred in the process. These costs include the cost of warehousing, packaging, transportation, and information processing.
Logistics involves the management of the flow of products from the point of origin to the point of consumption. Logistics management is responsible for planning, implementing, and controlling the movement of goods from the source to the destination.The cost of logistics includes all costs incurred in the process. These costs include the cost of warehousing, packaging, transportation, and information processing. The cost of logistics has a significant impact on the profitability of a company. Therefore, it is essential to manage the cost of logistics to ensure that a company can remain competitive in the market.The cost of warehousing is one of the major components of the total cost of logistics. The cost of warehousing includes the cost of rent, utilities, and labor. The cost of packaging is also a significant component of the total cost of logistics. The cost of packaging includes the cost of materials and labor.The cost of transportation is also a crucial component of the total cost of logistics. The cost of transportation includes the cost of fuel, maintenance, and labor. Finally, the cost of information processing is also a significant component of the total cost of logistics. The cost of information processing includes the cost of software, hardware, and labor.
In conclusion, the total cost of logistics includes the cost of warehousing, packaging, transportation, and information processing. The cost of logistics has a significant impact on the profitability of a company. Therefore, it is essential to manage the cost of logistics to ensure that a company can remain competitive in the market.
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how is x-y+z the same as x-(y+z) or (x-y)+z?
The expression "x - y + z" can be simplified and rearranged using the associative property and commutative property of addition. Let's break it down step by step:
1. x - y + z
According to the associative property of addition, the grouping of terms does not affect the result when only addition and subtraction are involved. Therefore, we can choose to group "y" and "z" together:
2. x + (-y + z)
Next, using the commutative property of addition, we can rearrange the terms "-y + z" as "z + (-y)":
3. x + (z + (-y))
Now, we have the expression "x + (z + (-y))". According to the associative property of addition, we can group "x" and "z + (-y)" together:
4. (x + z) + (-y)
Finally, we can rewrite the expression as "(x + z) - y", which is equivalent to "(x - y) + z":
5. (x + z) + (-y) = (x - y) + z
Therefore, "x - y + z" is indeed the same as both "x - (y + z)" and "(x - y) + z" due to the associative and commutative properties of addition.
The following are quiz scores in a class of 20 students: 40, 80, 64, 32, 63, 47, 82, 44, 39, 66, 31, 74, 85, 21, 95, 74, 25, 53, 77, 87. Hint: you may use Excel to calculate the following from this set of data: [1] Mode, [2] Range. Then in the box below enter the largest of your answer, to 2-decimal places, as calculated from [1] and [2
The following are quiz scores in a class of 20 students: 40, 80, 64, 32, 63, 47, 82, 44, 39, 66, 31, 74, 85, 21, 95, 74, 25, 53, 77, 87. Hint: you may use Excel to calculate the following from this set of data: [1] Mean, [2] Median, [3] Midrange. Then in the box below enter the largest of your answer, to 2-decimal places, as calculated from [1], [2], [3]
1. Mode: The mode is the value(s) that appears most frequently in the data set. In this case, there is no value that appears more than once, so there is no mode.
To calculate the mode, range, mean, median, and midrange of the given quiz scores, organize the data first:
40, 80, 64, 32, 63, 47, 82, 44, 39, 66, 31, 74, 85, 21, 95, 74, 25, 53, 77, 87
2. Range: The range is the difference between the largest and smallest values in the data set. The largest value is 95 and the smallest value is 21. So, the range is 95 - 21 = 74.
3. Mean: To calculate the mean, we sum up all the values and divide by the total number of values. Adding up all the scores, we get 1368. Dividing by 20 (the number of students), we get a mean of 68.4.
4. Median: The median is the middle value in a sorted data set. First, let's sort the data set in ascending order:
21, 25, 31, 32, 39, 40, 44, 47, 53, 63, 64, 66, 74, 74, 77, 80, 82, 85, 87, 95
There are 20 values, so the median is the average of the 10th and 11th values: (63 + 64) / 2 = 63.5.
5. Midrange: The midrange is the average of the largest and smallest values in the data set. The largest value is 95 and the smallest value is 21. So, the midrange is (95 + 21) / 2 = 58.
The largest value among the mean, median, and midrange is 68.4.
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A new vaccine against the coronavirus has been developed. The vaccine was tested on 10,000 volunteers and the study has shown that 65% of those tested do not get sick from the coronavirus.
Unfortunately, the vaccine has side effects and in the study it was proven that the likelihood
to get side effects among those who did not get sick is 0, 31, while the probability of getting
side effects among those who became ill with corona despite vaccination are 0, 15.
a) What is the probability that a randomly vaccinated person does not get sick from the coronavirus and does not get side effects?
b) What is the probability that a randomly vaccinated person gets side effects?
c) What is the probability of a randomly vaccinated person who has not had any side effects do not get sick from the coronavirus?
The probabilities are a) 0.2015 ,b) 0.283, c) 0.585.
a) Given that the vaccine was tested on 10,000 volunteers and it is shown that 65% of those tested do not get sick from the coronavirus. Therefore, the probability that a randomly vaccinated person does not get sick from the coronavirus = 65/100 = 0.65 And, the probability of getting side effects among those who did not get sick = 0.31
P(A and B) = P(A) * P(B|A), where A and B are two independent events
Hence, the probability that a randomly vaccinated person does not get sick from the coronavirus and does not get side effects P(A and B) = P(not sick) * P(no side effects|not sick)
= (0.65) * (0.31) = 0.2015 or 20.15%
Therefore, the probability that a randomly vaccinated person does not get sick from the coronavirus and does not get side effects is 0.2015 or 20.15%.
b) Probability of getting side effects among those who did not get sick = 0.31. Probability of getting side effects among those who became ill with corona despite vaccination = 0.15. Therefore, the probability that a randomly vaccinated person gets side effects
P(Side Effects) = P(no sick) * P(no side effects|no sick) + P(sick) * P(side effects|sick)= (0.65) * (0.31) + (1 - 0.65) * (0.15)
= 0.283
Therefore, the probability that a randomly vaccinated person gets side effects is 0.283 or 28.3%.
c) The probability of a randomly vaccinated person who has not had any side effects = P(no side effects)= P(no side effects and no sick) + P(no side effects and sick)= P(no side effects | no sick) * P(no sick) + P(no side effects | sick) * P(sick)= 0.31 * 0.65 + 0.85 * (1 - 0.65)= 0.585
Therefore, the probability of a randomly vaccinated person who has not had any side effects do not get sick from the coronavirus is 0.585 or 58.5%.
Therefore, the probabilities are a) 0.2015 ,b) 0.283, c) 0.585.
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2. Consider Helmholtz equation ∇²u(r)+k²u(r) = 0 in polar coordinates (p, θ). (a) show that the radial part of Helmholtz equation is p^2 d²R(p)/ dp^2+ p dR(p)/dp + (k²p²-m²)) R(p) = 0 (b) What are the possible solutions of Eq. (3) ? Note that the case k = 0 corresponds to the Laplace equation in two dimensional polar coordinates. For m = 0 we have Laplace equation in two dimensional polar coordinates with rotational symmetry.
In polar coordinates, the radial part of the Helmholtz equation is given by p^2 d²R(p)/dp^2 + p dR(p)/dp + (k²p² - m²) R(p) = 0. The possible solutions of this equation depend on the values of k and m. When k = 0, it reduces to the Laplace equation in two-dimensional polar coordinates, while m = 0 corresponds to the Laplace equation with rotational symmetry.
To obtain the radial part of the Helmholtz equation in polar coordinates, we consider the Laplacian operator ∇² expressed in terms of polar coordinates. Substituting this into the Helmholtz equation, we get p^2 d²R(p)/dp^2 + p dR(p)/dp + (k²p² - m²) R(p) = 0, where R(p) represents the radial part of the solution and k and m are constants.
The possible solutions of this equation depend on the values of k and m. When k = 0, the equation reduces to p^2 d²R(p)/dp^2 + p dR(p)/dp - m² R(p) = 0, which corresponds to the Laplace equation in two-dimensional polar coordinates.
For m = 0, the equation becomes p^2 d²R(p)/dp^2 + p dR(p)/dp + k²p² R(p) = 0, which represents the Laplace equation with rotational symmetry. In this case, the solution R(p) will have a form that exhibits rotational symmetry around the origin.
In summary, the radial part of the Helmholtz equation in polar coordinates is given by p^2 d²R(p)/dp^2 + p dR(p)/dp + (k²p² - m²) R(p) = 0. The possible solutions depend on the values of k and m, with k = 0 corresponding to the Laplace equation in two-dimensional polar coordinates and m = 0 representing the Laplace equation with rotational symmetry.
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Suppose {Zt} is a time series of independent and identically distributed random variables such that Zt N(0, 1). the N(0, 1) is normal distribution with mean 0 and variance 1. Remind: In your introductory probability, if Z ~ N(0, 1), so Z2 ~ x2(v = 1). Besides, if U~x2v),so E[U]=v andVarU=2v.
{Zt^2} follows a chi-squared distribution with 1 degree of freedom.
What distribution does Zt^2 follow?Given the time series {Zt} consisting of independent and identically distributed random variables, where each Zt follows a standard normal distribution N(0, 1) with mean 0 and variance 1. It is known that if Z follows N(0, 1), then Z^2 follows a chi-squared distribution with 1 degree of freedom (denoted as X^2(1)). Furthermore, for a chi-squared random variable U with v degrees of freedom, its expected value E[U] is equal to v, and its variance Var[U] is equal to 2v.
In summary, for the given time series {Zt}, each Zt^2 follows a chi-squared distribution with 1 degree of freedom (X^2(1)), and hence, E[Zt^2] = 1 and Var[Zt^2] = 2.
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Please help!!!! Please answer, this is my last question!!!
Step-by-step explanation:
See image below
Determine whether or not F is a conservative vector field. If it
is find a function f such that F = gradient f.
F(x,y) = (xy + y^2)i + (x^2 + 2xy)j.
From James Stewart Calculus 8th edition, chapter 16
The vector field F = (xy + y^2)i + (x^2 + 2xy)j is a conservative vector field, and a potential function f can be found such that F is the gradient of f.
To determine if F is a conservative vector field, we can check if it satisfies the condition of conservative vector fields, which states that the curl of F must be zero. Let's compute the curl of F:
curl F = (dF2/dx - dF1/dy) = ((d/dx)(x^2 + 2xy) - (d/dy)(xy + y^2))i + ((d/dy)(xy + y^2) - (d/dx)(x^2 + 2xy))j
= (2x + 2y - y) i + (x - 2x) j
= (2x + y) i - x j
Since the curl of F is not zero, we can conclude that F is not a conservative vector field.
However, if we take a closer look at the vector field, we can observe that the second component of F, (x^2 + 2xy)j, can be obtained as the partial derivative of a potential function with respect to y. This suggests that F may have a potential function f.
To find f, we integrate the second component of F with respect to y, treating x as a constant:
f(x, y) = ∫(x^2 + 2xy) dy = x^2y + xy^2 + C(x)
Here, C(x) represents an arbitrary function of x. To determine C(x), we differentiate f with respect to x and equate it to the first component of F:
∂f/∂x = (∂/∂x)(x^2y + xy^2 + C(x)) = (2xy + C'(x)) = xy + y^2
From this, we can conclude that C'(x) = y^2 and integrating C'(x) with respect to x gives C(x) = x y^2 + h(y), where h(y) is an arbitrary function of y.
Thus, the potential function f(x, y) is given by f(x, y) = x^2y + xy^2 + x y^2 + h(y), where h(y) is an arbitrary function of y.
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2. Let Y₁,, Yn denote a random sample from the pdf
f(y|0) = {r(20)/(20))^2 y0-¹ (1-y)-¹, 0≤y≤1,
0. elsewhere.
(a) Find the method of moments estimator of 0.
(b) Find a sufficient statistic for 0.
(a) To find the method of moments estimator (MME) of 0, we equate the first raw moment of the distribution to the first sample raw moment and solve for 0.
The first raw moment of the distribution can be calculated as follows: E(Y) = ∫ y f(y|0) dy. = ∫ y (r(20)/(20))^2 y^0-1 (1-y)^-1 dy= (r(20)/(20))^2 ∫ y^0-1 (1-y)^-1 dy= (r(20)/(20))^2 ∫ (1/y - 1/(1-y)) dy= (r(20)/(20))^2 [ln|y| - ln|1-y|] between 0 and 1 = (r(20)/(20))^2 [ln|1| - ln|0| - ln|1| + ln|1-1|] = (r(20)/(20))^2 (0 - ln|0| - 0 + ∞) = -∞.Since the first raw moment is -∞, it is not possible to equate it with the first sample raw moment to find the MME of 0. Therefore, the method of moments estimator cannot be derived in this case.
(b) To find a sufficient statistic for 0, we need to find a statistic that contains all the information about the parameter 0. In this case, a sufficient statistic can be derived using the factorization theorem. The likelihood function can be expressed as: L(0|Y₁,...,Yₙ) = ∏ [(r(20)/(20))^2 Yᵢ^0-1 (1-Yᵢ)^-1] To apply the factorization theorem, we can rewrite the likelihood function as: L(0|Y₁,...,Yₙ) = (r(20)/(20))^(2n) ∏ (Yᵢ^0-1 (1-Yᵢ)^-1). We can see that the likelihood function can be factorized into two parts: one that depends on the parameter 0 and one that does not. The term (r(20)/(20))^(2n) does not depend on 0, while the term ∏ (Yᵢ^0-1 (1-Yᵢ)^-1) depends only on the sample observations. Therefore, the statistic ∏ (Yᵢ^0-1 (1-Yᵢ)^-1) is a sufficient statistic for 0. In summary: (a) The method of moments estimator of 0 cannot be derived in this case. (b) The sufficient statistic for 0 is ∏ (Yᵢ^0-1 (1-Yᵢ)^-1).
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A 2018 poll of 3618 randomly selected users of a social media site found that 2463 get most of their news about world events on the site. Research done in 2013 found that only 46% of all the site users reported getting their news about world events on this site.
a. Does this sample give evidence that the proportion of site users who get their world news on this site has changed since2013? Carry out a hypothesis test and use a significance level.
ii. Compute the z-test statistic.
z= ?
To test whether the proportion of site users who get their world news on this site has changed since 2013, we can conduct a hypothesis test.
Let's define the following hypotheses:
Null Hypothesis (H₀): The proportion of site users who get their world news on this site is still 46% (no change since 2013).
Alternative Hypothesis (H₁): The proportion of site users who get their world news on this site has changed.
We will use a significance level (α) to determine the threshold for rejecting the null hypothesis. Let's assume a significance level of 0.05 (5%).
To perform the hypothesis test, we will calculate the z-test statistic, which measures the number of standard deviations the sample proportion is away from the hypothesized proportion.
The formula for the z-test statistic is:
[tex]z = \frac{{\hat{p} - p_0}}{{\sqrt{\frac{{p_0(1 - p_0)}}{n}}}}[/tex]
Where:
cap on p is the sample proportion ([tex]\frac{2463}{3618}[/tex] in this case)
p₀ is the hypothesized proportion (0.46 in this case)
n is the sample size (3618 in this case)
Calculating the z-test statistic:
[tex]z = \frac{{0.68 - 0.46}}{{\sqrt{\frac{{0.46 \cdot (1 - 0.46)}}{{3618}}}}}\\\\= \frac{{0.22}}{{\sqrt{\frac{{0.2488}}{{3618}}}}}\\\\\approx \frac{{0.22}}{{0.003527}}\\\\\approx 62.43[/tex]
Therefore, the z-test statistic is approximately 62.43.
Next, we would compare the calculated z-test statistic to the critical value from the standard normal distribution at the chosen significance level (α = 0.05). If the calculated z-value is beyond the critical value, we reject the null hypothesis and conclude that there is evidence that the proportion of site users who get their world news on this site has changed since 2013.
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Evaluate. (Assume x > 0.) Check by differentiating. S8x² In x dx થર S8x² 2 8x² In x dx =
The given expression is evaluated by integrating the function, and then checking its correctness by differentiating the result. The derivative of (8/3)x³ln(x) - (8/9)x³ is indeed equal to 8x²ln(x). Therefore, the evaluation and differentiation of the given expression confirm its correctness.
The integral to be evaluated is ∫8x²ln(x) dx. To integrate this expression, we can use integration by parts. Let's use the mnemonic device "LIATE" to determine the parts of the function:
L: Choose ln(x) as the first function
I: Choose 8x² as the second function
A: Take the derivative of ln(x) which is 1/x
T: Take the integral of 8x² which is (8/3)x³
E: Evaluate the integral of the remaining part
Applying integration by parts, we have:
∫8x²ln(x) dx = (8/3)x³ln(x) - ∫(8/3)x³(1/x) dx
Simplifying further:
∫8x²ln(x) dx = (8/3)x³ln(x) - (8/3)∫x² dx
∫8x²ln(x) dx = (8/3)x³ln(x) - (8/3)(1/3)x³ + C
∫8x²ln(x) dx = (8/3)x³ln(x) - (8/9)x³ + C
To verify the correctness of the result, we can differentiate the obtained expression with respect to x. The derivative of (8/3)x³ln(x) - (8/9)x³ is indeed equal to 8x²ln(x).
Therefore, the evaluation and differentiation of the given expression confirm its correctness.
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When it is operating properly, a chemical plant has a mean daily production of at least 740 tons. The output is measured on a simple random sample of 60 days. The sample had a mean of 715 tons/day and a standard deviation of 24 tons/day. Let µ represent the mean daily output of the plant. An engineer tests H0: µ ≥ = 740 versus H1: µ < 740.
a) Find the P-value.
b) Do you believe it is plausible that the plant is operating properly or are you convinced that the plant is not operating properly Explain your reasoning.
a) the P-value is less than 0.0001.
b) based on the below results we are convinced that the plant is not operating properly.
a) The test statistic is given by: z = (715 - 740) / (24 / √60) = - 4.70.
The P-value for a one-tailed test with this value of z is less than 0.0001.
b) Since the P-value is less than 0.05, the null hypothesis can be rejected at a 5% level of significance.
Thus, there is sufficient evidence to suggest that the mean daily production is less than 740 tons
. It is not plausible to assume that the plant is operating correctly at this time. Hence, based on the above results we are convinced that the plant is not operating properly.
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The communications monitoring company Postini has reported that 91% of e-mail messages are spam. You randomly chose 15 e-mails. What is the probability you get exactly 13 spam messages? (Round your answer to 4 decimal places)
The question is about probability. It is given that the probability of receiving spam messages is 91%. Now we are to find the probability of getting exactly 13 spam messages out of 15 emails randomly selected.
Here, let X be the random variable such that X denotes the number of spam messages out of 15 e-mails. Hence, X follows the binomial distribution with the following parameters:
n= 15 (as we have 15 emails)P= 0.91 (as the probability of spam messages is 91%)Q= 1-P = 0.09 (as the probability of non-spam messages is 9%)
We know that, if X is the random variable which follows binomial distribution with parameters n and p, then the probability mass function of X is given by:
P(X=k) = (n C k) * (p^k) * (q^(n-k))
Putting n= 15, p=0.91 and q= 0.09, we get:
P(X= 13) = (15 C 13) * (0.91^13) * (0.09^2)P(X= 13) = (105) * (0.39222) * (0.0081)P(X= 13) = 0.3367.
Therefore, the probability of getting exactly 13 spam messages out of 15 randomly selected emails is 0.3367.
Thus, we have determined the probability of getting exactly 13 spam messages out of 15 emails randomly selected which is 0.3367.
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The number of pizzas consumed per month by university students is normally distributed with a mean of 14 and a standard deviation of 4
What is the probability that in a random sample of size 9, a total of more than 108 pizzas are consumed?
Therefore, the probability that in a random sample of size 9, a total of more than 108 pizzas are consumed is approximately 0.9332, or 93.32%.
To find the probability that in a random sample of size 9, a total of more than 108 pizzas are consumed, we need to calculate the cumulative probability of the sample total being greater than 108.
Given that the number of pizzas consumed per month by university students is normally distributed with a mean of 14 and a standard deviation of 4, we can use the properties of the normal distribution to solve this problem.
Calculate the mean and standard deviation of the sample total:
Mean of the sample total = sample size * population mean = 9 * 14 = 126
Standard deviation of the sample total = square root(sample size) * population standard deviation = √9 * 4 = 12
Standardize the value 108 using the formula:
z = (x - mean) / standard deviation
For 108:
z = (108 - 126) / 12 = -1.5
Calculate the cumulative probability using the standard normal distribution table or a calculator:
P(Z > -1.5)
Looking up the value in the standard normal distribution table or using a calculator, we find that P(Z > -1.5) is approximately 0.9332.
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11. A population of bacteria begins with 512 and is halved every day.
a) Write an equation for the number of bacteria y as a function of the
number of days x.
b) Graph the equation from part a.
c) What is the domain of the equation in the context of this problem?
d) What is the range of the equation in the context of this problem?
nit 5
Solving Quadratia Equations
a. The exponential function that represent the number of bacteria is
y = 512 * 0.5ˣ
b. The graph of the exponential function is below
c. The domain is all negative non-integers
d. The range is all positive non-integers
What is the equation for the number of bacteria y as a function of the number of days?a) The equation for the number of bacteria y as a function of the number of days x can be written as an exponential function
y = 512 * (1/2)ˣ
Where y represents the number of bacteria and x represents the number of days.
b) Kindly find the attached graph below.
c) In the context of this problem, the domain of the equation would be all non-negative integers, since we are considering the number of days, which cannot be negative.
d) The range of the equation would be all positive integers, since the number of bacteria starts at 512 and continues to decrease as the days increase.
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The following data correspond to the population of weights of the mixture of mature composting (ready to produce seedlings) obtained at the end of the month from an organic waste management farm (weight in kg): 451,739; 373,498; 405,782; 359,288; 431,392; 535,875; 474,717; 375,949; 449,824; 449,357
Select the value that represents your relative dispersion?
The value that represents the relative dispersion is 15.11%.
The value that represents the relative dispersion of the given data is the coefficient of variation (CV).
The CV is calculated as the ratio of the standard deviation to the mean, expressed as a percentage.
To calculate the relative dispersion, we first find the mean and standard deviation of the data set.
The mean is obtained by summing all the values and dividing by the number of data points.
The standard deviation measures the spread or dispersion of the data around the mean.
Using the given data: 451,739; 373,498; 405,782; 359,288; 431,392; 535,875; 474,717; 375,949; 449,824; 449,357, we can calculate the mean and standard deviation.
After calculating the mean, which is the sum of all the values divided by 10, we find it to be 425,842.3 (rounded to one decimal place).
Then, we calculate the standard deviation using the formula for sample standard deviation.
By applying the appropriate formulas, we find that the standard deviation is 64,396.1 (rounded to one decimal place).
To obtain the relative dispersion or coefficient of variation, we divide the standard deviation by the mean and multiply by 100 to express it as a percentage.
The coefficient of variation (CV) is found to be approximately 15.11% (rounded to two decimal places).
Therefore, the value that represents the relative dispersion is 15.11%.
The CV provides an indication of the variability relative to the mean, allowing for comparison across different data sets with varying means.
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AABC is shown in the diagram below. Y B X Suppose the following sequence of matrix operations was used to translate AABC. [11]+[4]0¹ ¹¹ 1_1] =___________ How would you describe the magnitude and di
The given sequence of matrix operations is incomplete.
Describe the magnitude and direction of the translation applied to the triangle AABC using the given sequence of matrix operations.The given sequence of matrix operations, [11]+[4]0¹ ¹¹ 1_1], is not complete. It seems to be a combination of addition and multiplication operations, but it lacks some necessary elements to determine the complete result.
To describe the magnitude and direction of the translation, we would need additional information about the translation vector.
The vector [11] represents a translation of 11 units in the x-direction and 11 units in the y-direction.
However, without the complete sequence of operations or information about the starting position of AABC, we cannot provide a specific description of the magnitude and direction of the translation.
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A line intersects the points (1,7) and (2, 10). m = 3 Write an equation in point-slope form using the point (1, 7). y- [?] =(x-[ Enter
The equation in point-slope form using the point (1, 7) and slope m = 3 is
y - 7 = 3(x - 1)
To write the equation in point-slope form, we start with the formula:
y - y₁ = m(x - x₁)
where (x₁, y₁) represents the given point and m is the slope.
Given that the point (1, 7) lies on the line, we substitute x₁ = 1 and y₁ = 7 into the formula. Since the slope is given as m = 3, we substitute this value as well.
Plugging in the values, we get:
y - 7 = 3(x - 1)
This is the equation in point-slope form, where y-7 represents the change in the y-coordinate and x-1 represents the change in the x-coordinate.
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The equation in point-slope form using the point (1, 7) and slope m = 3 is
y - 7 = 3(x - 1)
To write the equation in point-slope form, we start with the formula:
y - y₁ = m(x - x₁)
where (x₁, y₁) represents the given point and m is the slope.
Given that the point (1, 7) lies on the line, we substitute x₁ = 1 and y₁ = 7 into the formula. Since the slope is given as m = 3, we substitute this value as well.
Plugging in the values, we get:
y - 7 = 3(x - 1)
This is the equation in point-slope form, where y-7 represents the change in the y-coordinate and x-1 represents the change in the x-coordinate.
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Express in sigma notation. Which of the following shows both correct sigma notations for Find the sum of the series. Find the sum of the series. Find the sum of the series. Determine whether the series converges or diverges.
Given series: `5 - 15 + 45 - 135 + 405 - ...`We can see that the series is an infinite geometric series.
Here, `a = 5` and `r = -3`.As we know, the formula for the sum of an infinite geometric series is given by:`S = a/(1-r)`, where `|r| < 1`.So, substituting the given values of `a` and `r`, we get:`S = 5/(1-(-3)) = 5/4`Thus, the sum of the given series is `5/4`.Sigma notation of the given series:$$\begin{aligned}\sum_{k=1}^{\infty} (-3)^{k-1} \cdot 5\end{aligned}$$Determine whether the series converges or diverges:Since the value of `|r|` is greater than `1`, the given series is a divergent series. Thus, the given series diverges.
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The sum of the given series is `5/4`.
The given series diverges.
Given series: `5 - 15 + 45 - 135 + 405 - ...`We can see that the series is an infinite geometric series. Here, `a = 5` and `r = -3`.
As we know, the formula for the sum of an infinite geometric series is given by:
`S = a/(1-r)`, where `|r| < 1`.
So, substituting the given values of `a` and `r`, we get: `S = 5/(1-(-3)) = 5/4`
Thus, the sum of the given series is `5/4`.
Sigma notation of the given series: [tex]$$\begin{aligned}\sum_{k=1}^{\infty} (-3)^{k-1} \cdot 5\end{aligned}$$[/tex]
Determine whether the series converges or diverges: Since the value of `|r|` is greater than `1`, the given series is a divergent series.
Thus, the given series diverges.
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Find two linearly independent solutions of 2x2y′′−xy′+(5x+1)y=0,x>02x2y″−xy′+(5x+1)y=0,x>0
of the form
y1=xr1(1+a1x+a2x2+a3x3+⋯)y1=xr1(1+a1x+a2x2+a3x3+⋯)
y2=xr2(1+b1x+b2x2+b3x3+⋯)y2=xr2(1+b1x+b2x2+b3x3+⋯)
where r1>r2.r1>r2.
Enter
r1=r1=
a1=a1=
a2=a2=
a3=a3=
r2=r2=
b1=b1=
b2=b2=
b3=b3=
The terms with the same powers of x:
[tex][x^{(r_1+1)}] [2r_1(r_1-1)(r_1-2)(1 + a_1x + a_2x^2 + a_3x^3 + ...) - (5x + 1)(1 + a_1x + a_2x^2 + a_3x^3 + ...)] + [x^r_1] [2r_1(r_1-1)(a_1 + 2a_2x + 3a_3x^2 + ...) - (1 + a_1x + a_2x^2 + a_3x^3[/tex]
To find two linearly independent solutions of the given differential equation, we'll start by finding the indicial equation. Let's assume the solutions have the form:
[tex]y_1 = xr_1(1 + a_1x + a_2x^2 + a_3x^3 + ...)[/tex]
[tex]y_2 = xr^2(1 + b_1x + b_2x^2 + b_3x^3 + ...)[/tex]
Substituting these solutions into the differential equation, we have:
[tex]2x^2y'' - xy' + (5x + 1)y = 0[/tex]
Let's find the derivatives:
[tex]y' = r_1xr_1-1(1 + a_1x + a_2x^2 + a_3x^3 + ...) + xr_1(a_1 + 2a_2x + 3a_3x^2 + ...)[/tex]
[tex]y'' = r_1(r_1-1)x(r_1-2)(1 + a_1x + a_2x^2 + a_3x^3 + ...) + r_1(r_1-1)x(a_1 + 2a_2x + 3a_3x^2 + ...) + r_1xr_1(a_1 + 2a_2x + 3a_3x^2 + ...)[/tex]
Now, substitute these derivatives back into the differential equation:
[tex]2x^2[r_1(r_1-1)x(r_1-2)(1 + a_1x + a_2x^2 + a_3x^3 + ...) + r_1(r_1-1)x(a_1 + 2a_2x + 3a_3x^2 + ...) + r_1xr_1(a_1 + 2a_2x + 3a_3x^2 + ...)] - x[r_1xr_1-1(1 + a_1x + a_2x^2 + a_3x^3 + ...) + xr_1(a_1 + 2a_2x + 3a_3x^2 + ...)] + (5x + 1)[xr_1(1 + a_1x + a_2x^2 + a_3x^3 + ...)] = 0[/tex]
Expanding and collecting like terms, we have:
[tex]2r_1(r_1-1)(r_1-2)x^{(r_1+1)}(1 + a_1x + a_2x^2 + a_3x^3 + ...) + 2r_1(r_1-1)(a_1 + 2a_2x + 3a_3x^2 + ...)x^{(r_1+1)} + 2r_1(a_1 + 2a_2x + 3a_3x^2 + ...)x^{r_1} + (5x + 1)[xr_1(1 + a_1x + a_2x^2 + a_3x^3 + ...)] - xr_1(1 + a_1x + a_2x^2 + a_3x^3 + ...) - xa_1x^{(r_1-1)} - xa_2x^{(r_1)} - xa_3x^{(r_1+1)} = 0[/tex]
Now, we group the terms with the same powers of x:
[tex][x^{(r_1+1)}] [2r_1(r_1-1)(r_1-2)(1 + a_1x + a_2x^2 + a_3x^3 + ...) - (5x + 1)(1 + a_1x + a_2x^2 + a_3x^3 + ...)] + [x^r_1] [2r_1(r_1-1)(a_1 + 2a_2x + 3a_3x^2 + ...) - (1 + a_1x + a_2x^2 + a_3x^3[/tex]
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What is the area of the regular polygon below? Round your answer to the nearest tenth and be sure to show all of your work.
Answer: 100in^2
Step-by-step explanation:
Formula for area of regular polygon: (1/2)*(apothem)*(perimeter)
The apothem is 5, and the perimeter is 5*2*4=40. Plug in the numbers:
0.5*5*40=100
Consider a functionsort which takes as input a list of 5 integers (i.e., input (0,01.012,03,04) where each die Z), and returns the list sorted in ascending order. For example: sort(9,40,5, -1)-(-1,0,4,5,9) (a) What is the domain of sort? Express the domain as a Cartesian product (6) Show that sort is not a one-to-one function.
The sort function maps two distinct input lists to the same output list. Hence, the sort function is not a one-to-one function.
(a) Domain of sort function: The domain of sort function can be expressed as a Cartesian product of all the possible input values of the function.
Here, the sort function takes a list of 5 integers (Z1, Z2, Z3, Z4, Z5) as input.
Therefore, the domain of the sort function is: Z × Z × Z × Z × Z
(b) Sort function is not a one-to-one function: A function is called one-to-one if it maps distinct elements from its domain to distinct in its range. Here, we can show that the sort function is not a one-to-one function because it maps some distinct inputs to the same output value.
For example, consider the following two input lists:
(9, 40, 5, -1) and (9, 5, 40, -1)
If we apply the sort function to both of these input lists, we get the same sorted output list: (-1, 5, 9, 40)
Therefore, the sort function maps two distinct input lists to the same output list. Hence, the sort function is not a one-to-one function.
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Connie’s first three test scores are 79%, 87%, and 98%. What must she score on her fourth test to have an overall mean of exactly 90%?
Step-by-step explanation:
You want the average of FOUR test scores to equal 90 :
( 79 + 87 + 98 + x ) / 4 = 90 ( assuming they are all weighted equally)
x = 90*4 - 79 - 87 - 98 = 96 % needed
Let f: C\ {0} → C be a holomorphic function such that
f(z) = f (1/z)
for every z £ C\ {0}. If f(z) £ R for every z £ OD(0; 1), show that f(z) £ R for every Z£R\ {0}. Hint: Schwarz reflection principle may be useful.
The function f(z) = f(1/z) for every z ∈ ℂ{0} implies that f(z) is symmetric with respect to the unit circle. Since f(z) ∈ ℝ for z ∈ OD(0; 1), we can extend this symmetry to the real axis and conclude that f(z) ∈ ℝ for z ∈ ℝ{0}.
Consider the function g(z) = f(z) - f(1/z). From the given condition, we have g(z) = 0 for every z ∈ ℂ{0}. We can show that g(z) is an entire function. Let's denote the Laurent series expansion of g(z) around z = 0 as g(z) = ∑(n=-∞ to ∞) aₙzⁿ.
Since g(z) = 0 for every z ∈ ℂ{0}, we have aₙ = 0 for every n < 0, since the Laurent series expansion around z = 0 does not contain negative powers of z. Therefore, g(z) = ∑(n=0 to ∞) aₙzⁿ.
Now, let's consider the function h(z) = g(z) - g(1/z). We can observe that h(z) is also an entire function, and h(z) = 0 for every z ∈ ℂ{0}. By the Identity Theorem for holomorphic functions, since h(z) = 0 for infinitely many points in ℂ{0}, h(z) = 0 for every z ∈ ℂ{0}. Thus, g(z) = g(1/z) for every z ∈ ℂ{0}.
Now, let's focus on the real axis. For z ∈ ℝ{0}, we have z = 1/z, which implies g(z) = g(1/z). Since g(z) = f(z) - f(1/z) and g(1/z) = f(1/z) - f(z), we obtain f(z) = f(1/z) for every z ∈ ℝ{0}. This means that f(z) is symmetric with respect to the real axis.
Since f(z) is symmetric with respect to the unit circle and the real axis, and we know that f(z) ∈ ℝ for z ∈ OD(0; 1), we can conclude that f(z) ∈ ℝ for every z ∈ ℝ{0}.
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1. Consider the bases B = (₁, ₂) and B' = {₁, ₂} for R², where [2]. U₂ = -4--0-0 (a) Find the transition matrix from B' to B. (b) Find the transition matrix from B to B'. (c) Compute the coordinate vector [w]B, where 3 -[-] -5 and use (12) to compute [w]B. (d) Check your work by computing [w]g directly. W
We see that the vector we got in (c) is correct, therefore, the correct solution is A = [1, 2 -1, -1], P = 1/3 [1, 1 2, -1], [w]B = [4/3, -1/3], [w] g = [2, -5].
(a) Transition matrix from B' to B is as follows;
Since B = {v₁, v₂} is the new basis vector and B' = {e₁, e₂} is the original basis vector, we have to consider the matrix as follows;
[v₁]B' = [1, -1] [e₁]B'[v₂]B'
= [2, -1] [e₂]B'
=> Matrix A will be, A = [v₁]B' [v₂]B'
= [1, 2 -1, -1]
(b) Transition matrix from B to B' is as follows;
Now we need to find the transition matrix from B to B'. This can be done by using the formula;
P = A^(-1)
where P is the matrix of transformation from B to B', and A^(-1) is the inverse of matrix A. Matrix A is found in (a), and its inverse is also easy to find, and it is;
A^(-1) = 1/3 [1, 1 2, -1]
Then the matrix of transformation from B to B' is;
P = 1/3 [1, 1 2, -1]
(c) Compute the coordinate vector [w]B, where 3 -[-] -5 and use (12) to compute [w]B.
The coordinate vector [w]B is found by using the formula [w]B = P[w]B'
Here, we don't know [w]B', so we have to compute that first.
We have the vector w as 3 -[-] -5, but we don't know its coordinates in the original basis. Since B' is the original basis, we have to find [w]B';
[w]B'
= [3, -5] [e₁]B'
= [1, 0] [e₂]B'
=> Matrix B will be, B = [w]B' [e₁]B' [e₂]B'
= [3, 1, 0 -5, 0, 1]
Now we can use the matrix P in (b) to find the coordinates of w in B. Therefore,
[w]B = P[w]B'
= 1/3 [1, 1 2, -1][3 -5]
= [4/3, -1/3]
(d) Check your work by computing [w]g directly.
Now we have to check whether the vector we got in (c) is correct or not.
We can do that by transforming [w]B into the original basis using matrix A;
[w]g = A[w]B
Here, A is the matrix found in (a), and [w]B is found in (c).
Therefore, we have;
[w]g = [1, 2 -1, -1][4/3 -1/3]
= [2, -5]
So, we see that the vector we got in (c) is correct, because its transformation in the original basis using A gives the same vector as w. Therefore, our answer is;
A = [1, 2 -1, -1]P = 1/3 [1, 1 2, -1][w]B = [4/3, -1/3][w]g = [2, -5]
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Find the orthogonal projection of
0
0
v= 0
6
onto the subspace W of R4 spanned by
1 -1 -1
-1 -1 1
1 1 1
1 -1 1
projw (v)=
To find the orthogonal projection of vector v onto the subspace W, we can use the formula proj_w(v) = A(A^T A)^(-1) A^T v, where A is the matrix whose columns are the basis vectors of W.
Let's denote the matrix A as A = [[1, -1, -1, -1], [-1, 1, 1, -1], [-1, -1, 1, 1], [1, 1, -1, 1]]. We can find the orthogonal projection of v onto W by calculating the product A(A^T A)^(-1) A^T v. First, we need to compute A^T A. Taking the transpose of A and multiplying it with A gives us a 4x4 symmetric matrix. Next, we calculate the inverse of A^T A to obtain (A^T A)^(-1).
Finally, we can substitute the values into the formula proj_w(v) = A(A^T A)^(-1) A^T v. Multiply the matrices together to obtain the projection vector.
The resulting vector will be the orthogonal projection of v onto the subspace W spanned by the given basis vectors.
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express the length x in terms of the trigonometric ratios of .
The Length x in terms of the trigonometric ratios is b / (√3 - 1).
Given, In a right triangle ABC,
angle A = 30° and angle C = 60°.
We have to find the length x in terms of trigonometric ratios of 30°.
Now, In a right-angled triangle ABC,
AB = x,
angle B = 90°,
angle A = 30°, and angle C = 60°.
Let BC = a.
Then, AC = 2a.
By applying Pythagoras theorem in ABC, we get;
[tex]{(x)^2} + {(a)^2} = {(2a)^2}[/tex]
⇒[tex]{(x)^2} + {(a)^2} = 4{(a)^2}[/tex]
⇒[tex]{(x)^2} = 3{(a)^2}[/tex]
⇒ x = a√3 …….(i)
Now, consider a right-angled triangle ACD with angle A = 30° and angle C = 60°.
Here AD = AC / 2 = a.
Let CD = b.
Then, the length of BD is given by;
BD = AD tan 30°
= a / √3
Now, in a right-angled triangle BCD,
BC = a and BD = a / √3.
Therefore,
CD = BC - BD
⇒ b = a - a / √3
⇒ b = a {(√3 - 1) / √3}
Therefore,
x = a√3 {From equation (i)}
= a {(√3) / (√3)}
= a {√3}
Hence, x = b / (√3 - 1)
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