Answer:
Step-by-step explanation:
?A single toss of a fair coin results in either 0 or 1 head, each with probability 1/2. Define H= number of
heads obtained on a single toss. The mean of His My = 0.5 and the standard deviation of His oH = 0.5.
Suppose you toss a fair coin four times. Define T= total number of heads obtained. Find the mean and standard deviation of T.
Answer:
µT = 2 (The mean of T is 2)
σT = 1 (The standard deviation of T is 1)
Step-by-step explanation:
This involves the transformation and combination of random variables. We know that the coin flips are independent as the knowledge of one coin flip will not affect the next or another coin flip.
The question has a transformation of H by essentially multiplying it by 4 that, then turns it into T. Knowing that we can multiply the mean of 0.5 by 4 with rules of a linear transformation when multiplying each observation by a positive constant. With that, we get the mean of T to equal 2.
Since we know it is independent, we can solve for standard deviation. To do so, we have to add 0.5 squared 4 times and square root it. That will look like this: Squareroot(0.5^2+0.5^2+0.5^2+0.5^2). That will give you 1 as the standard deviation for T.
obtain the three best subsets according to the c p criterion, whicbi:of these subset models appears to have the smallest bias?
I may utilize the Cp Criterion, AICp, and SBCp to aid in choosing the optimal model. All of them impose sanctions for introducing predictions.
What is subset regression model?
Best subsets regression is a model-building regression analysis that is exploratory. It compares every model that might be built using a specified set of predictors.
There are Cp Criterion, AICp and SBCp that I can use to help select the best model. They all place penalties for adding predictors.
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a repeated-measures anova with 5 subjects has df within-treatment equal to 12. what is the value for dferror for this analysis?
the value for dferror for this analysis is 8.
What is error?
Error is the difference between an actual value and an estimate, or approximate, representation of that value in applied mathematics. The discrepancy between the population's average and the average of a sample taken from that population is a frequent example in statistics. The discrepancy between an irrational number's true value and the values of rational expressions like 22/7, 355/113, 3.14, or 3.14159 serves as an example of round-off error in numerical analysis. A truncation error happens when an infinite series is ignored for all but a small number of terms. For instance, the sum of the infinite series can be used to express the exponential function ex.
df-error = (df-within treatment) - (df-subjects)
df-subjects = n - 1 = 5 - 1 = 4 {n is the no of subjects}
df-within treatment = 12
df-error = 12 - 4 = 8
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A bank vice president feels that each savings account customer has, on average, three credit cards. He collected data over a period of time and found the probability distribution given in the following table. The random variable X, represents the number of credit cards people own. If necessary, use a leading zero and round to 2 decimal places, e.g, 0.25. (a) Find the probability that a savings account customer selected at random will have more than two credit cards. (b) Find the expected value of the number of credit cards a randomly selected customer owns. (c) Find the standard deviation of the number of credit cards a randomly selected customer owns.
a)The probability that a customer selected will have more than two credit cards is 0.11 ,b)expected value is 1.34 and c)standard deviation is 0.96.
Given, probability distribution table
X p(X)
0 0.18
1 0.44
2 0.27
3 0.08
4 0.03
where,X= number of credit cards people own
probability that a savings account customer selected at random will have more than two credit cards, p(X>2)=p(3)+P(4)=0.08+0.03=0.11Expected value of the number of credit cards a randomly selected customer owns Expected value or mean,[tex]\mu=\sum\limits^4_{n=0} X*P(X)=0*P(0)+1*P(1)+2*P(2)+3*P(3)+4*P(4)\\\\\mu=0+1(0.44)+2(0.27)+3(0.08)+4(0.03)\\\\\mu=0+0.44+0.54+0.24+0.12\\\\\mu=1.34[/tex]Standard deviation of number of credit cards. Standard deviation,[tex]\sigma=\sqrt{\sum(X-\mu)^2P(X)}\\\\=\sqrt{(-1.34)^2(0.18)+(0.34)^2(0.44)+(0.66)^2(0.27)+(1.66)^2(0.08)+(2.66)^2(0.03)}\\\\=\sqrt{(1.7956)(0.18)+(0.1156)(0.44)+(0.4356)(0.27)+(2.7556)(0.08)+(7.0756)(0.03)}\\\\=\sqrt{0.323208+0.050864+0.117612+0.220448+0.212268}\\\\=\sqrt{0.9244}\\\\=0.96[/tex]Thus, the probability that a customer selected will have more than two credit cards is 0.11 ,expected value is 1.34 and standard deviation is 0.96.
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Your question is incomplete, Here is the complete question.
A bank vice president feels that each savings account customer has, on average, three credit cards. He collected data over a period of time and found the probability distribution given in the following table. The random variable X, represents the number of credit cards people own.
X p(X)
0 0.18
1 0.44
2 0.27
3 0.08
4 0.03
If necessary, use a leading zero and round to 2 decimal places, e.g, 0.25.
(a) Find the probability that a savings account customer selected at random will have more than two credit cards ?
(b) Find the expected value of the number of credit cards a randomly selected customer owns ?
(c) Find the standard deviation of the number of credit cards a randomly selected customer owns ?
in the photo below please!!!!
Answer:
[tex]\cos(\theta) + \sin(\theta)[/tex]
Step-by-step explanation:
Use the sine angle sum identity.
[tex]\sin(a+b)=\sin(a)\cos(b)+\cos(a)\sin(b)[/tex]
[tex]\sin(45\textdegree + \theta)=\sin(45\textdegree)\cos(\theta)+\cos(45\textdegree)\sin(\theta)[/tex]
Now, simplify [tex]\sin(45\textdegree)[/tex] and [tex]\cos(45\textdegree)[/tex] to [tex]\dfrac{\sqrt2}{2}[/tex]:
[tex]\sin(45\textdegree + \theta)=\dfrac{\sqrt2}{2} \cdot \cos(\theta)+\dfrac{\sqrt2}{2} \cdot \sin(\theta)[/tex]
Then, factor out [tex]\dfrac{\sqrt2}{2}[/tex] from each term.
[tex]\sin(45\textdegree + \theta)=\dfrac{\sqrt2}{2} \cdot ( \cos(\theta)+\sin(\theta))[/tex]
Finally, identify what is in the parentheses corresponding to the blank space in the question.
[tex]\cos(\theta) + \sin(\theta)[/tex]
Which 2 recycling plants have equivalent ratios of green bottles recycled in one day?
Recycling| Green bottles recycled|total recyled
A. ..............| .........12.............................| 135
B............... |......... 16............................ | 172
C............... | .........14............................ | 154
D.............. |.......... 18............................ | 198
Plants C and D have the same ratios of green bottles to total bottles recycled.
What is Ratio?The ratio is defined as a relationship between two quantities, it is expressed as one divided by the other.
The table is given in the question,
As per the given question, the required solution would be as:
For plant A,
The ratio of green bottles to total bottles
⇒ 16/172 = 4/43
For plant B,
The ratio of green bottles to total bottles
⇒ 12/135 = 4/45
For plant C,
The ratio of green bottles to total bottles
⇒ 14/154 = 1/11
For plant D,
The ratio of green bottles to total bottles
⇒ 18/198 = 1/11
Thus, plants C and D have the same ratios of green bottles to total bottles recycled.
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a scatterplot shows: a. the average value of groups of data. b. scores on one variable plotted against scores on a second variable. c. the frequency with which values appear in the data d. the proportion of data falling into different categories.
Scores on one variable plotted against scores on a second variable.
The correct answer is (b)
Now, According to the question:
Let's know:
A scatterplot shows:
A scatterplot shows the relationship between two quantitative variables measured for the same individuals. The values of one variable appear on the horizontal axis, and the values of the other variable appear on the vertical axis. Each individual in the data appears as a point on the graph.
Hence, The correct answer is (b) i.e.,
Scores on one variable plotted against scores on a second variable.
Given,
In the question:
A scatterplot shows:
a. the average value of groups of data.
b. scores on one variable plotted against scores on a second variable.
c. the frequency with which values appear in the data
d. the proportion of data falling into different categories.
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Tanya bought a cake for $18 and cookies for $1.50 each. If she spent $27.00, how many cookies did she buy?
Answer: 18 cookies
Step-by-step explanation:
27 divided by 1.50 = 18
Answer:
Step-by-step explanation:
6 cookies
assume that blood pressure readings are normally distributed with a mean of 116 and a standard deviation of 4.8. if 36 people are randomly selected, find the probability that their mean blood pressure will be less than 118.
The probability that mean blood pressure less than 118 is 0.9938.
We have given that,
blood pressure are normally distributed mean of 116
i.e. μ = 116
standard deviation σ = 4.8
n = 36
and we have to find probability that their mean blood pressure will be less than 118.
The formula to find the above probability is,
P(Z=X) = (x - μ) / (σ/[tex]\sqrt{n}[/tex] )
⇒ P(Z < 118) = (118 - 116) / 4.8/[tex]\sqrt{36}[/tex]
= 2 / (4.8/6)
= 2/0.8
P(Z < 118) = 2.5
From the z-table the value of z at 2.5 is 0.9938,
⇒ P(Z < 118) = 0.9938.
Therefore the probability that their mean blood pressure will be less than 118 is 0.09938.
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Find the Gradient of the line drawn below.
Answer:
3 ,0
Step-by-step explanation:
In vector calculus, the gradient of a scalar-valued differentiable function f of several variables is the vector field \nabla f whose value at a point p is the "direction and rate of fastest increase". Wikipedia
Answer:
1/3
Step-by-step explanation:
We need two easy-to-read points on grid intersections.
Look at the point on the y-axis. It is (0, 3).
Now go up to the right until you find the next easy-to-read point.
It is (3, 4) which is on a grid intersection.
gradient = run/rise
rise = distance in y (vertical distance)
run = distance in x (horizontal distance)
We start at (0, 3) and go to (4, 4) by going only vertically and horizontally.
From (0, 3), go 1 unit up. That is a rise of 1.
Then go 3 units right. That is a run of 3.
gradient = rise/run = 1/3
Answer: 1/3
If the probability that the Islanders will beat the Rangers in a game is 4/7, what is the probability that the Islanders will win exactly two out of four games in a series against the Rangers? Round your answer to the nearest thousandth.
The probability that the islanders will win exactly two games is 0.359.
How to find probability using binomial distribution?The binomial distribution is based on the binomial theorem which can be written as (a + b)ⁿ = ⁿC₀aⁿb⁰ + ⁿC₁aⁿ⁻¹b¹ + ⁿC₂aⁿ⁻²b²+ ....+ ⁿCₙa₀bⁿ.
In order to use in the probability, there should be events independent of each other and the sum of there probabilities is 1.
Given that,
The probability of winning is 4/7.
Then the probability to lose is 1 - 4/7 = 3/7.
If islanders win exactly two games out of four, it implies that they will lose 2 as well.
Now, the probability of winning exactly two games can be found using binomial distribution as given below,
⁴C₂(4/7)²(3/7)²
= 6 × 16/49 × 9/49
= 864/2401
= 0.359
Hence, the probability of winning exactly two games is 0.359.
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the number 120 is increased by 50%, and the result is then decreased by 30% to give the number x. what is the value of x?
Answer: x = 126
Step-by-step explanation:
We know that 50% of 120 is 60. So, to increase 120 by 50%, we add 60. This gets us 180. Next, we find 30% of 180. This is 54. So, we subtract 54 from 180. So, x = 126
two independent samples of sizes 40 and 50 are randomly selected from two populations to test the difference between the population means . the sampling distribution of the sample mean difference is:
The sampling distribution is t= 88 degrees of freedom.
To find the sampling distribution of the sample mean difference we need to do a two-sample t-test: equal variances.
When we do a two-sample t-test, we have to take into account the following assumptions:
1) the sample variances are normal.
2) the sample variances of both populations are equal.
Now, let the sample size be [tex]n_x[/tex] and [tex]n_y[/tex] respectively and the means be [tex]x^-[/tex] and [tex]y^-[/tex] respectively.
Now, we are assuming that the distribution of x and y are
[tex]x\sim N([/tex]mewx, [tex]\sigma x = \sigma[/tex])
[tex]y\sim N[/tex] (mewy, [tex]\sigma y = \sigma[/tex])
Accordingly, the system of hypothesis is defined by:
Null hypothesis: mewx=mewy
alternatively, it can also be mewx≠ mewy
Then, the random sample t is distributed as [tex]t\sim t_n_x+ny-2[/tex] with the degrees of freedom given as df= [tex]n_x+n_y-2[/tex] =40+50-2= 88
So, in this case answer will be 88 degrees of freedom.
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Define T in L(C2) by T(w,z)=(−z,w).
Find the generalized eigenspaces corresponding to the distinct eigenvalues of T.
I believe that once I have the eigenvalues, I know how to find the eigenspaces, but I'm not sure I'm looking for the eigenvalues correctly.
I know that if the eigenvalues are a,b corresponding to (w,0) and (0,z) respectively, then (ab)=1, since a(w)=−z implies ab(−z)=−z. But I think my whole approach to this is wrong and that I'm missing some very elementary idea.
T is the linear transformation described by T(w,z) in L(C2). This indicates that the linear transformation T changes two-dimensional vectors of the type (w,z) to (-z,w).
To get T's eigenvalues, solve the equation T(v) = v, where is the eigenvalue and v is the eigenvector. By solving this equation, we discover that T's eigenvalues are λ1 = -1 and λ2 = 1.
For each eigenvalue, the associated eigenspaces are the subspaces of C2 that are spanned by the eigenvectors of T. The eigenspace is the subspace covered by the eigenvector λ1= -1 is (1,0). The eigenspace is the subspace spanned by the eigenvector λ2= 1 is (0,1).
As a result, the subspaces covered by (1,0) and (1,1) are the generalized eigenspaces corresponding to the different eigenvalues of T. (0,1).
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I need help on this it’s Unit 3: Parallel & Perpendicular Lines
Homework 7: Point-Slope Form
The equation for given Parallel & Perpendicular Lines points and slope and given below.
what is parallel and perpendicular lines?
In a plane, parallel lines are those whose distances between them are constant. Parallel lines do not cross. Lines that cross at a right angle of 90 degrees are said to be perpendicular.
The equation of a line in slope-intercept form y = mx + c
1. substitute x = 0, y = 3 and m = -2 in equation
3 = -2*0 + c
c = 3, substitute in equation
Then y = -2x + 3
2. substitute x = -3 , y = - 5 and m = -( 3/5 ) in equation
-5 = -( 3/5 )*(-3 ) + c
c = - 34/5 , substitute in equation
Then 5y = -3x - 34
3. substitute x = -8 , y = 6 and m = -(1/4) in equation
6 = -(1/4)*(-8 )+ c
c = 8, substitute in equation
Then y = -2x + 8
The equation of line passing through two points is m = ( y2 - y1) / ( x2 - x1)
4. The given points is ( 1, 3) and ( -3, -5) and substitute in above equation.
Then m = 2
substitute m = 2 and ( 1, 3) in equation y = mx + c
Then c = 1
substitute m = 2 and c = 1 in equation of y = mx + c
Then the equation is y = 2x + 1
5. The given points is ( 1, 4) and ( 6, -1 ) and substitute in above equation.
Then m = - (5/4)
substitute m = - (5/4) and ( 1, 4) in equation y = mx + c
Then c = 21/4
substitute m = - (5/4) and c = 21/4 in equation of y = mx + c
Then the equation is 4y = -5x + 21
6. The given points is ( -12,14) and ( 6, -1 ) and substitute in above equation.
Then m = - (5/6)
substitute m = - (5/6) and( -12,14) in equation y = mx + c
Then c = 4
substitute m = - (5/6) and c = 4 in equation of y = mx + c
Then the equation is y = - ( 5/6 ) + 4
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last qustion i need so i need a right answer
The exponential equation of the logarithmic equation ㏑ (x² - 5 · x + 17) = 3 · x + 2 is x² - 5 · x + 17 = e³ˣ ⁺ ².
What is the exponential form of a logarithmic equation?
In this question we find that a logarithmic equation, in which we must eliminate the log operator must be eliminated by relationship between logarithmic and exponential equations, whose relationship is shown below:
Logarithm of an exponential equation
㏒ aˣ = x
Exponential up to an logarithmic equation
[tex]a^{\log x}[/tex] = x
Now, we proceed to eliminate the log operator by algebra properties and relationship between logarithmic and exponential equations:
㏑ (x² - 5 · x + 17) = 3 · x + 2
By using an "exp" operators, we get the following expression:
x² - 5 · x + 17 = e³ˣ ⁺ ²
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Put the steps in order that are used to solve the following systems of equations by substitution.
-7x - 2y
2y
= x= 2 (-4) +11 → x = 3
x
-
=
= - 13
11
= x - 2y = 11 → x = 2y + 11
=y=-4
= -7 (2y + 11) - 2y = -13
= (3,-4)
= -16y = 64
= -16y - 77 = -13
= -14y-77-2y = -13
Answer:
yes I will get suspicious and then
Step-by-step explanation:
he was in a meeting
Here is an incomplete calculation of 534 divided by 6
The missing number for A is
The missing number for B is
The missing number for C is
Answer:
Step-by-step explanation:
a 23
b 43
c 56
The point A(6,-6) is rejected over the origin and it’s image is point B what is are coordinates of point B
The coordinates of point B is (-6, 6) if the point A(6,-6) is rejected over the origin and it’s image is point B
What is geometric transformation?It is defined as the change in coordinates and the shape of the geometrical body. It is also referred to as a two-dimensional transformation. In the geometric transformation, changes in the geometry can be possible by rotation, translation, reflection, and glide translation.
It is given that:
Point A(6,-6) is reflected over the origin and it’s image is point B
The rule for transformation:
(x, y) --> (-x, -y)
(6, -6) --> (-6, 6)
Thus, the coordinates of point B is (-6, 6) if the point A(6,-6) is rejected over the origin and it’s image is point B
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an urban economist wishes to estimate the proportion of americans who own their homes. what size sample should be obtained if he wishes the estimate to be within 0.02 with 90% confidence if (a) he uses a 2010 estimate of 0.669 obtained from the u.s. census bureau
The sample size for the given problem is 1499.
What is sample size?
The process of deciding how many observations or replicates to include in a statistical sample is known as sample size determination. Any empirical study with the aim of drawing conclusions about a population from a sample must take into account the sample size as a crucial component.
Given:
An urban economist wishes to estimate the proportion of Americans who own their homes.
p cap = 0.669
1 - p cap = 0.331
margin of error = E = 0.02
[tex]Z_a_l_p_h_a_/_2[/tex]= 1.645
Sample size = n
[tex]n = (Z_a_l_p_h_a_/_2/E)^2*Pcap*(1 - Pcap)\\= (\frac{1.645}{0.02})^2*0.669*0.331\\ = 1499[/tex]
Hence, the sample size for the given problem is 1499.
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if 40% of population is 4500 what is the total population?
Answer:
11250
Step-by-step explanation:
solve the simultaneous equation
5x-4y=19
x+2y=8
Chris had bowling and hockey training on the 1 May. He has bowling training every 8 days and hockey training every 2 days. On what date will he have both training sessions again? answer quick pls
The date that Chris will have both training sessions again is May 9.
How to calculate the date?In mathematics, a multiple simply means the product of any quantity. It should be noted that a multiple illustrate to the product of a number given.
In this situation, since Christ has bowling training every 8 days and hockey training every 2 days. The lowest common multiple for 2 and 8 is 8.
Therefore, the next date will be the addition of the day of the training and the number of days that are needed when the lowest common multiple was calculated. This will be illustrated thus:
= May 1 + 8 days
= May 9
The next training is May 9.
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assume a simple model with only two countries: the united states and germany, and two goods: beer and motorcycles. suppose that the opportunity cost for the united states to produce 1 beer is 3 motorcycles and the opportunity cost for germany to produce 1 beer is 1/2 motorcycles. which of the following statements is true
The statement opportunity cost for Germany to produce 1 beer is 1/2 motorcycles is true.
The German economy would be better off if it produced beer and traded motorcycles with the US.
Germans would benefit from specializing in producing beer and engaging in trade with the United States since their opportunity cost is lower (1/2 is less than 3).
A country is said to be having a comparative advantage in producing a good if it can produce it at a lower opportunity cost. Germany has a lower opportunity cost in producing beer so it has a comparative advantage in making beer.
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Water leaks from a crack in a vase at a rate of 0.5 cubic inches per minute. How long does it take for 20% of the water to leak from a full vase? I either got 10 minutes or 2.5...
The amount of time it would take for 20% of the water to leak from a full vase is equal to 24.128 minutes.
How to calculate the volume of a cone?Mathematically, the volume of a cone can be calculated by using this formula:
V = 1/3 × πr²h
Where:
V represents the volume of a cone.h represents the height.r represents the radius.From the diagram of the cone (see attachment), we have the following parameters:
Diameter of cone = 4.8 in.
Height of cone = 10 in.
Radius of cone = diameter/2 = 4.8/2 = 2.4 in.
Substituting the given parameters into the formula, we have;
Volume of cone, V = 1/3 × 3.142(2.4² × 10)
Volume of cone, V = 60.32 in³.
For the volume of water that has leaked, we have:
Volume of water leaked = 20/100 × 60.31
Volume of water leaked = 12.062 in³.
For the required amount of time, we have:
Time = Volume/Rate
Time = 12.064/0.5
Time = 24.128 minutes.
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What is the simplified version of the expression
(x^1/2 y^1/9 )^3
The simplified version of the expression (x¹/² y¹/⁹)³ is (x³/² y¹/³)
How to determine the simplified expression?From the question, we have the following parameters that can be used in our computation:
(x^1/2 y^1/9 )^3
Rewrite the expression properly
So, we have
(x¹/² y¹/⁹)³
Open the brackets
This gives
(x¹/² y¹/⁹)³ = (x¹/²)³ * (y¹/⁹)³
Evaluate the expression in brackets
(x¹/² y¹/⁹)³ =(x³/² y¹/³)
Hence, the solution is (x³/² y¹/³)
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I need HELPPP!!!!! Pls
Mitch can make 7 bracelet every 30 minute. At thi rate, how many bracelet can he make in 3. 5 hour?
Answer:
49 bracelets
Step-by-step explanation:
Let the number of bracelets that can be made be x.
First, let us convert 3.5 hours into minutes.
3.5 * 60 = 210 minutes
Accordingly,
Time (min) Number of bracelets
30 ⇒ 7
210 ⇒ x
Now, we can make an expression like this using cross multiplication.
30x = 7 × 210
30x = 1470
Divide both sides by 30.
x = 49
[tex]sin^2x=\frac{secx-cosx}{secx}[/tex]
There are three commonly used trigonometric identities.
Sin x = 1/ cosec x
Cos x = 1/ sec x
Tan x = 1/ cot x or sin x / cos x
Cot x = cos x / sin x
sin²x = (sec x - cos x) / sec x is,
sin²x + cos²x = 1
(proved)
What are trigonometric identities?There are three commonly used trigonometric identities.
Sin x = 1/ cosec x
Cos x = 1/ sec x
Tan x = 1/ cot x or sin x / cos x
Cot x = cos x / sin x
We have,
sin²x = (sec x - cos x) / sec x
We will prove that,
sin²x + cos²x = 1
sec x = 1/cos x
Now,
sec x - cos x
= 1/cos x - cos x
= (1 - cos²x) / cos x
Now,
sin²x = (1 - cos²x) / [(cos x) x 1/cos x]
sin²x = 1 - cos²x
sin²x + cos²x = 1
Proved
Thus,
sin²x = (sec x - cos x) / sec x is,
sin²x + cos²x = 1
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pls help me i really need help
Answer:
4 mph
1.5 mph
5 mph
Fastest: Kaliel, slowest: steve
Step-by-step explanation:
The unit for Melissia can be found by finding the slope of the line. The slope is shown to be 4 miles per hour. That is the unit rate, 4 miles per hour.
The unit rate for steve is also shown in the equation y = 1.5x. This equation is the filled in form of y = mx + b where m is equivalent to the slope. Therefore 1.5 is the slope meaning the unit rate is 1.5 miles per hour.
The unit rate for Kaliel is found using the information that he walks 10 miles in two hours. To find how much he goes in 1 hour divide by two getting you 5 miles per hour.
The fastest unit rate is Kalie with 5 miles per hour, and the slowest steve with 1.5 miles per hour.