Answer:
2 = x (by the symmetric property) and x = y, so y = 2 by the transitive property.
A company estimates that it will sell N(x) units of product after spending $x thousands on advertising, as given by
N(x) = -.25x^4 + 13x^3 - 180x^2 + 10,000 15<= x <= 24
When is the rate of change of sales increasing and when is it decreasing? What is the point of diminishing returns and the maximum rate of change of sales? Graph N and N' on the same coordinate system.
The rate of change of sales is increasing when x < 15 and decreasing when x > 15. The point of diminishing returns occurs at x = 15, where the maximum rate of change of sales is reached.
Graphing N(x) and N'(x) on the same coordinate system visually represents the sales and its rate of change. The rate of change of sales, N'(x), is increasing when x < 15 and decreasing when x > 15. This can be determined by analyzing the sign of the derivative N'(x) = -x^3 + 39x^2 - 360x.
The point of diminishing returns corresponds to x = 15, where the rate of change changes from positive to negative. At this point, the maximum rate of change of sales is achieved. The graph N(x) and N'(x) on the same coordinate system, plot the function N(x) = -.25x^4 + 13x^3 - 180x^2 + 10,000 and the derivative N'(x) = -x^3 + 39x^2 - 360x. The x-axis represents the advertising spending (x), and the y-axis represents the units of product sold (N) and the rate of change of sales (N').
By plotting N(x) and N'(x) on the same graph, we can visually observe the behavior of sales and its rate of change over the given range of x (15 to 24). The graph allows us to identify the point of diminishing returns at x = 15 and visualize the maximum rate of change of sales.
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Tutorial Exercise 3 Given that ex dx = e3-e, use this result to evaluate 2ex + 7 dx. Step 1 Using laws of exponents, we have e7ee4e-2X Submit Skip (you cannot come back)
The value of ∫2ex + 7 dx is 2(e3-e) + 7x + C.
∫2e3 x e-x + 7 dx= 2∫e3 x e-x dx + 7 ∫dx= 2(e3-e) + 7x + C,
where C is the constant of integration.
The value of ∫2ex + 7 dx is 2(e3-e) + 7x + C.
The given problem is asking us to evaluate the integral of 2ex + 7 dx.
Let's solve the problem step by step:
Step 1: We have to use the given result to evaluate the integral.
Using the laws of exponents we can write:
ex dx = e3-e
⇒ ex dx = e3 x e-x dx.
Step 2: Now let's substitute the above result in our given problem
2ex + 7 dx= 2(e3 x e-x) + 7 dx
= 2e3 x e-x + 7 dx.
Step 3: Now, we can integrate the above expression using the power rule of integration.
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(a) Find the values of z, zER, for which the matrix
x3 x
9 1
has inverse (marks-2 per part)
x=
x=
x=
(b) Consider the vectors - (3,0) and 7- (5,5).
(i.) Find the size of the acute angle between i and ü. Angle-
(ii). If -(k, 3) is orthogonal to , what is the value of ke k [2 marks]
(c) Let J be the linear transformation from R2 R2 which is a reflection in the horizontal axis followed by a scaling by the factor 2.
(i) If the matrix of J is W y 1₁ what are y and z
y= [2 marks]
z= [2 marks] U N || 62 -H 9 has no inverse. [6 marks-2 per part] [2 marks]
(d) Consider the parallelepiped P in R³ whose adjacent sides are (0,3,0), (3, 0, 0) and (-1,1, k), where k € Z. If the volume of P is 180, find the two possible values of k. [4 marks-2 each]
k=
k=
(e) Given that the vectors = (1,-1,1,-1, 1) and =(-1, k, 1, k, 8) are orthogonal, find the magnitude of . Give your answer in surd form. [3 marks]
v=
(a) To find the values of z for which the matrix does not have an inverse, we can set up the determinant of the matrix and solve for z when the determinant is equal to zero.
The given matrix is:
|x3 x|
|9 1|
The determinant of a 2x2 matrix can be found using the formula ad - bc. Applying this formula to the given matrix, we have:
Det = (x3)(1) - (9)(x) = x3 - 9x
For the matrix to have an inverse, the determinant must be non-zero. Therefore, we solve the equation x3 - 9x = 0:
x(x2 - 9) = 0
This equation has two solutions: x = 0 and x2 - 9 = 0. Solving x2 - 9 = 0, we find x = ±3.
So, the values of x for which the matrix has no inverse are x = 0 and x = ±3.
(b) (i) To find the size of the acute angle between the vectors (3,0) and (5,5), we can use the dot product formula:
u · v = |u| |v| cos θ
where u and v are the given vectors, |u| and |v| are their magnitudes, and θ is the angle between them.
Calculating the dot product:
(3,0) · (5,5) = 3(5) + 0(5) = 15
The magnitudes of the vectors are:
|u| = sqrt(3^2 + 0^2) = 3
|v| = sqrt(5^2 + 5^2) = 5 sqrt(2)
Substituting these values into the dot product formula:
15 = 3(5 sqrt(2)) cos θ
Simplifying:
cos θ = 15 / (3(5 sqrt(2))) = 1 / (sqrt(2))
To find the acute angle θ, we take the inverse cosine of 1 / (sqrt(2)):
θ = arccos(1 / (sqrt(2)))
(ii) If the vector (-k, 3) is orthogonal to (5,5), it means their dot product is zero:
(-k, 3) · (5,5) = (-k)(5) + 3(5) = -5k + 15 = 0
Solving for k:
-5k = -15
k = 3
So, the value of k is 3.
(c) Let J be the linear transformation from R2 to R2 that reflects points in the horizontal axis and then scales them by a factor of 2. The matrix of J can be found by multiplying the reflection matrix and the scaling matrix.
The reflection matrix in the horizontal axis is:
|1 0|
|0 -1|
The scaling matrix by a factor of 2 is:
|2 0|
|0 2|
Multiplying these two matrices:
J = |1 0| * |2 0| = |2 0|
|0 -1| |0 2| |0 -2|
So, the matrix of J is:
|2 0|
|0 -2|
Therefore, y = 2 and z = -2.
(d) The volume of a parallelepiped can be found by taking the dot product of two adjacent sides and then taking the absolute value of the result.
The adjacent sides of the parallelepiped P are (0,3,0)
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Use the modified Euler's method to obtain an approximate
solution of dy/dt = -2ty², y(0) = 1, in the interval 0 ≤t≤ 0.5
using h = 0.1. Compute the error and the percentage error. Given
the exact
The given differential equation is dy/dt = -2ty², y(0) = 1, in the interval 0 ≤t≤ 0.5 using h = 0.1.
The modified Euler's method is given by:
yi+1 = yi + 1/2 * h[f(ti, yi) + f(ti+1, yi + h*f(ti, yi))]
The step size is h = 0.1. And, the values of the solution of y and t are to be determined at each step of the method.
We have:y0 = 1t0 = 0h = 0.1
We need to determine the values of t and y at each step until t = 0.5.
We can use the formula to determine these values.
Using Euler's method we get;
yi+1 = yi + hf(ti, yi)
Let us now fill the table as shown below:tiyi= y[tex](t)0.00.11(0 + 0.1)2y1= 1 + 0.1[-2(0) (1)2]= 1.0020.12(0.1 + 0.1)2y2= 1.002 + 0.1[-2(0.1)(1.002)2]= 1.0040.23(0.2 + 0.1)2y3= 1.004 + 0.1[-2(0.2)(1.004)2]= 1.0080.34(0.3 + 0.1)2y4= 1.008 + 0.1[-2(0.3)(1.008)2]= 1.0150.45(0.4 + 0.1)2y5= 1.015 + 0.1[-2(0.4)(1.015)2]= 1.0260.5[/tex]
The values of t and y are shown in the table above. At t = 0.5,
the approximate solution of the given differential equation is y5 = 1.026.
Let us now find the error and percentage error between the approximate solution and the exact solution.
The exact solution of the given differential equation is y = 1 / (1 + t²).
The value of the exact solution at t = 0.5 isy = 1 / (1 + 0.5²) = 0.8.
The error is given by;e = y - y5= 0.8 - 1.026= -0.226
The percentage error is given by;% error = [e / y] * 100= [(-0.226) / 0.8] * 100= -28.25%.
Therefore, the approximate solution of the given differential equation by using the modified Euler's method is y5 = 1.026. And, the error and percentage error between the approximate solution and the exact solution are -0.226 and -28.25% respectively.
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Consider a sample of observations {X1, X2, ..., Xn). You are given: n the mean x = 115.58, the standard deviation s =0.694, and X₁ = 577.9. Calculate ₁x², if it exists. =1
The value of X₁² is 334027.61.
The first observation squared, X₁², we can use the given information:
X₁ = 577.9
X₁², we simply square X₁:
X₁² = (577.9)²
Calculating this expression gives:
X₁² = 334027.61
X₁² = X₁ * X₁
The values:
X₁ = 577.9
X₁²:
X₁² = 577.9 * 577.9
X₁² ≈ 333,822.41
Therefore, the value of X₁² is 334027.61.
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Question 4: Let A be a 2 x 2 matrix such that A2 = A. Find the characteristic and the minimal polynomials of A.
The characteristic polynomial of matrix A is λ² - (a + d)λ + (ad - bc).
The minimal polynomial of matrix A is (x)(x - 1).
To find the characteristic polynomial of matrix A, we need to calculate the determinant of (A - λI), where λ is an eigenvalue and I is the identity matrix.
Let's assume the matrix A is:
A = | a b |
| c d |
We have A² = A, so we can write:
A² = A
A² - A = 0
A(A - I) = 0
Now, let's calculate the determinant of (A - λI):
| a - λ b |
| c d - λ |
Det(A - λI) = (a - λ)(d - λ) - bc
= ad - aλ - dλ + λ² - bc
= λ² - (a + d)λ + (ad - bc)
This is the characteristic polynomial of matrix A. The characteristic polynomial is used to find the eigenvalues of the matrix.
To find the minimal polynomial of matrix A, we need to find the smallest degree polynomial that satisfies P(A) = 0, where P(x) is the minimal polynomial.
Since A² - A = 0, we can conclude that the minimal polynomial must divide x² - x. Therefore, the minimal polynomial of matrix A can be either x, x - 1, or (x)(x - 1).
To determine the minimal polynomial, we can substitute A into each of these polynomials and check which one results in the zero matrix.
Let's substitute A into each of the possibilities:
(A - 0I) = A, which is not the zero matrix.
(A - I) = | a - 1 b |
| c d - 1 |, which is not the zero matrix.
(A)(A - I) = | a(a - 1) + bc ab - b |
| c(a - 1) + d cb + d(d - 1) |, which is the zero matrix.
Therefore, the minimal polynomial of matrix A is (x)(x - 1).
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Find the point on the graph of z = 2y^2 – 3x^2 at which vector n = (36, 24, 3) is normal to the tangent plane.
P=
Find the linear approximation to f(x, y, z) = ху/z at the point (-2,3,-2):
f(x, y, z) =
The linear approximation to `f(x, y, z) = xy/z` at the point `(-2, 3, -2)` is `L(x, y, z) = 6`.
The first part of the question is asking to find the point on the graph of `z = 2y^2 – 3x^2` at which the vector `n = (36, 24, 3)` is normal to the tangent plane.
To find the point of intersection, follow these steps:
1. Find the partial derivatives of `z = 2y^2 – 3x^2` with respect to x and y. `∂z/∂x = -6x` and `∂z/∂y = 4y`.
2. Evaluate the partial derivatives at a point on the surface (x,y,z) to obtain the gradient vector. `grad(z) = (-6x, 4y, 1)`.
3. Use the dot product to find the tangent plane. `r · grad(z) = 36x - 24y + 3z = c`.
4. Use the given normal vector `n = (36, 24, 3)` to find the constant `c` of the tangent plane. `c = r · n = -2(36) - 3(24) + 2(9) = -147`.
5. Substitute `c` into the equation of the tangent plane. `36x - 24y + 3z = -147`.
6. Substitute `z = 2y^2 - 3x^2` into the equation of the tangent plane. `36x - 24y + 6y^2 - 9x^2 = -147`.
7. Solve the equation to find the x and y coordinates of the point of intersection. `x = ±3, y = ±2`.
8. Substitute the x and y values into `z = 2y^2 - 3x^2` to obtain the z-coordinate. `z = -21`
.Therefore, the point on the graph of `z = 2y^2 – 3x^2` at which `n = (36, 24, 3)` is normal to the tangent plane is `P = (-3, -2, -21)`.
The second part of the question is asking to find the linear approximation to `f(x, y, z) = xy/z` at the point `(-2, 3, -2)`.
The linear approximation is given by:`L(x, y, z) = f(a, b, c) + ∂f/∂x(a, b, c)(x - a) + ∂f/∂y(a, b, c)(y - b) + ∂f/∂z(a, b, c)(z - c)`where `a = -2`, `b = 3`, and `c = -2`.
1. Find the partial derivatives of `f(x, y, z) = xy/z` with respect to x, y, and z.`∂f/∂x = y/z`, `∂f/∂y = x/z`, `∂f/∂z = -xy/z^2`.
2. Evaluate the partial derivatives at the point `(-2, 3, -2)` to obtain the gradient vector. `grad(f) = (-3/2, 1, 3/4)`.
3. Use the formula to find the linear approximation. `L(x, y, z) = f(-2, 3, -2) - (3/2)(x + 2) + (y/(-2))(y - 3) + (-3/8)(z + 2)`.
4. Substitute the point `(-2, 3, -2)` into the linear approximation. `L(-2, 3, -2) = 6 - (3/2)(-2 + 2) + (3/(-2))(3 - 3) + (-3/8)(-2 + 2) = 6`.
Therefore, the linear approximation to `f(x, y, z) = xy/z` at the point `(-2, 3, -2)` is `L(x, y, z) = 6`.
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Given the function f(x,y)=x³-5x² + 4xy-y2-16x - 10.
Which ONE of the following statements is TRUE?
A. (-2,-4) is a maximum point of f and ( 8/3 , 16/3) is a saddled point of f.
B. None of the choices in this list.
C. (-2,-4) is a minimum point of f and (8/3, 16/3) is a maximum point of f.
D. Both (-2.-4) and (8/3, 16/3) are saddle points of f.
The statement that is TRUE is option D: Both (-2,-4) and (8/3, 16/3) are saddle points of f. To determine the critical points of the function f(x, y), we need to find the points where the partial derivatives with respect to x and y are equal to zero.
Taking the partial derivatives of f(x, y) with respect to x and y, we get:
∂f/∂x = 3x² - 10x + 4y - 16
∂f/∂y = 4x - 2y
Setting these partial derivatives equal to zero and solving the system of equations, we find the critical points. In this case, the critical points are (-2, -4) and (8/3, 16/3).
To determine the nature of these critical points, we can use the second partial derivative test.
By calculating the second partial derivatives and evaluating them at the critical points, we can determine whether they correspond to maximum points, minimum points, or saddle points.
By evaluating the second partial derivatives at (-2, -4) and (8/3, 16/3), we find that the determinant of the Hessian matrix is negative for both points, indicating that they are saddle points.
Therefore, option D is the correct statement as it correctly identifies (-2, -4) and (8/3, 16/3) as saddle points of the function f(x, y).
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If you deposit $3,725 into an account that is compounded weekly for fifteen years, what will the account balance be if the interest rate is 3.75%?
Answer:
The account balance after fifteen years with a $3,725 initial deposit and a 3.75% interest rate compounded weekly would be approximately $6,544.32.
Step-by-step explanation:
To calculate the future account balance with compound interest, we can use the formula for compound interest:
A = P * (1 + r/n)^(n*t)
Where:
A = the future account balance
P = the principal amount (initial deposit)
r = the interest rate (as a decimal)
n = the number of times interest is compounded per year
t = the number of years
Given:
P = $3,725
r = 3.75% = 0.0375 (as a decimal)
n = 52 (weekly compounding, since there are 52 weeks in a year)
t = 15 years
Substituting these values into the formula, we can calculate the future account balance:
A = $3,725 * (1 + 0.0375/52)^(52*15)
A ≈ $6,544.32
We test the null hypothesis H0: μ = 10 and the alternative Ha: μ ≠ 10 for a Normal population with σ = 4. A random sample of 16 observations is drawn from the population and we find the sample mean of these observations is = 12. The P-value is CLOSEST to: A. 0.9772. B. 0.0456. C. 0.0228. D. 0.6170.
Therefore, the P-value is closest to 0.0456, which corresponds to option B.
To determine the P-value for testing the null hypothesis H0: μ = 10 against the alternative hypothesis Ha: μ ≠ 10, we can use a t-test since the population standard deviation is unknown.
Given that the sample size is 16, the sample mean is 12, and the population standard deviation is σ = 4, we can calculate the t-value and find the corresponding P-value.
The formula for the t-value is:
t = (sample mean - population mean) / (sample standard deviation / √(sample size))
Calculating the t-value:
t = (12 - 10) / (4 / √(16)) = 2 / 1 = 2
Since we have a two-tailed test (μ ≠ 10), we need to find the probability of obtaining a t-value greater than 2 or less than -2.
Using a t-distribution table or calculator with degrees of freedom (df) = sample size - 1 = 16 - 1 = 15, we find that the probability of obtaining a t-value greater than 2 or less than -2 is approximately 0.0456.
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You are conducting a study to see if the proportion of voters who prefer Candidate A is significantly different from 50%. With Ha : p ≠ 50% you obtain a test statistic of z = − 3.226 . Find the p-value accurate to 4 decimal places.
The p-value accurate to 4 decimal places is `0.0013`.
Below is the calculation for finding the p-value accurate to 4 decimal places.
Test statistic `z = -3.226
`Distribution is normal
Population proportion is `p = 0.50`
Null Hypothesis `H 0: p = 0.50`
Alternate Hypothesis `Ha: p ≠ 0.50`
We can find the p-value using the following steps:
Find the appropriate test statistic for the null hypothesis z0
Calculate the standard deviation of the sampling distribution σM
Use the standard deviation and sample size to estimate the standard error SE of the sample proportion
Using the formula p= x/n , the sample proportion is:
SE = sqrt[p(1-p)/n]
SE = sqrt[0.5 * 0.5/ n] = 0.5 / √(n)
For a two-tailed test, the p-value is:
P-value = P(Z < z0) + P(Z > z0)
P-value = P(Z < -3.226) + P(Z > 3.226)
P-value = 0.00063 + 0.00063
P-value = 0.00126, if round to 4 decimal places, it will be `0.0013
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Use the last six digits to give values to a, b, c, d, f and g in this coursework, but replace any zeros with the value 1, as shown in this example: 08765400abcdfg: a = 8, b = 7, c = 6,d=5, f = 4, g = 1 Note: e is not used for one of these values to avoid confusion with the (natural) exponential function, i.e., e* = exp(x) in this coursework. Part 4) a) Derive the first four terms of the binomial series for (1 + x) ³. b) Calculate the number obtained by dividing the five digits bcdfg by b x 104. Use the series that you have found in a) to calculate the cube root of this number. You should work to eight decimal places. c) Find the error in the value that you have calculated in b).
The answers are a = 8, b = 7, c = 6, d = 5, f = 4, g = 1
a) The binomial series for (1 + x)³ is given by:
(1 + x)³ = 1 + 3x + 3x² + x³
Substituting x = 1, we get:
(1 + 1)³ = 1 + 3(1) + 3(1)² + (1)³
= 1 + 3 + 3 + 1
= 8
b) Dividing the five digits bcdfg by b x 10⁴, we have:
bcdfg / (7 x 10⁴)
Substituting the values, we get:
6541 / (7 x 10⁴)
= 6541 / 70000
= 0.093442857 (approx.)
Using the binomial series from part a), we can calculate the cube root of the number:
Cube root of 0.093442857 ≈ (1 + (3/10)x + (3/10²)x² + (1/10³)x³)
Substituting x = 0.093442857 in the series, we get:
≈ 1 + (3/10)(0.093442857) + (3/10²)(0.093442857)² + (1/10³)(0.093442857)³
Evaluating this expression to eight decimal places, we find:
≈ 1.02754823
c) To find the error in the value calculated in part b), we can compare it with the actual cube root of 0.093442857.
The actual cube root is approximately 0.45011514. Therefore, the error in the calculated value is:
Error = Actual value - Calculated value
= 0.45011514 - 1.02754823
= -0.57743309
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The answers are a = 8, b = 7, c = 6, d = 5, f = 4, g = 1
a) The binomial series for (1 + x)³ is given by:
(1 + x)³ = 1 + 3x + 3x² + x³
Substituting x = 1, we get:
(1 + 1)³ = 1 + 3(1) + 3(1)² + (1)³
= 1 + 3 + 3 + 1
= 8
b) Dividing the five digits bcdfg by b x 10⁴, we have:
bcdfg / (7 x 10⁴)
Substituting the values, we get:
6541 / (7 x 10⁴)
= 6541 / 70000
= 0.093442857 (approx.)
Using the binomial series from part a), we can calculate the cube root of the number:
Cube root of 0.093442857 ≈ (1 + (3/10)x + (3/10²)x² + (1/10³)x³)
Substituting x = 0.093442857 in the series, we get:
≈ 1 + (3/10)(0.093442857) + (3/10²)(0.093442857)² + (1/10³)(0.093442857)³
Evaluating this expression to eight decimal places, we find:
≈ 1.02754823
c) To find the error in the value calculated in part b), we can compare it with the actual cube root of 0.093442857.
The actual cube root is approximately 0.45011514. Therefore, the error in the calculated value is:
Error = Actual value - Calculated value
= 0.45011514 - 1.02754823
= -0.57743309
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Find a general solution to the given differential equation. 56y"+17y'-3y=0 A general solution is y(t) = c₁ e - Too + C₂ e 1 311 -t
The general solution of the given differential equation is y(t) = 28.929e^(-0.06875t) - 25.929e^(0.04518t).
A second-order differential equation is a differential equation in which the highest derivative of the unknown function is of order two. The general solution of the given differential equation 56y" + 17y' - 3y = 0 is y(t) = c₁ e^(-t/56) + C₂ e^(3t/17). A solution to the given differential equation that contains two arbitrary constants is known as the general solution.
Because the differential equation is linear, any linear combination of two particular solutions will also be a solution.
Consider the differential equation 56y" + 17y' - 3y = 0. For y = e^(rt), where r is a constant, let's solve the associated characteristic equation 56r^2 + 17r - 3 = 0. The roots of the characteristic equation are r = (-17 ± sqrt(17^2 + 4*56*3)) / (2*56) = -0.06875, 0.04518.
Because both roots are distinct and real, the general solution is y(t) = c₁ e^(-0.06875t) + C₂ e^(0.04518t). We'll use initial values to figure out what values of the constants c₁ and c₂ work.
Let y = f(t) be the solution to the initial value problem y"(t) + 17y'(t) - 3y(t) = 0, y(0) = 3, y'(0) = 1.
We can find c₁ and c₂ by substituting the initial values into the general solution. We get 3 = c₁ + C₂, 1 = -0.06875c₁ + 0.04518C₂.
We may now solve these two equations for c₁ and c₂ to obtain c₁ = 28.929 and c₂ = -25.929.
Differential equation is y(t) = 28.929e^(-0.06875t) - 25.929e^(0.04518t).
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The number of banks in a country for the years 1935 through 2009 is given by the following function.
f(x)=
81.9x+12,364 if x<90
−376.4x+48,686 if x≥90
, where x is the number of years after 1900
Complete parts (a)-(b).
Question content area bottom
Part 1
a) What does this model give as the number of banks in
1960?
2000?
The number of banks in 1960 is
enter your response here.
The U.S. Crude Oil production, in billions of barrels, for the years from 2005 projected to 2025, can be modeled
y=−0.001x2+0.047x+1.987,
with x equal to the years after 2005 and y equal to the number of billions of barrels of crude oil.
a. Find and interpret the vertex of the graph of this model.
b. What does the model predict the crude oil production will be in 2028?
c. Graph the function for the years 2005 to 2025.
Question content area bottom
Part 1
a. The vertex of the graph of this model is v=(enter your response here,enter your response here).
(Round to three decimal places as needed.)
The number of banks in 1960 is 19,474, and the number of banks in 2000 is 5,586.
How many banks were there in 1960 and 2000?In 1960, according to the given function, the number of banks can be calculated by substituting x = 60 (years after 1900) into the function f(x). Evaluating this, we get: f(60) = 81.9(60) + 12,364 = 4,914 + 12,364 = 17,278. Therefore, the number of banks in 1960 is 17,278.
Similarly, for the year 2000, we substitute x = 100 (years after 1900) into the function f(x). Evaluating this, we get: f(100) = -376.4(100) + 48,686 = -37,640 + 48,686 = 11,046. Therefore, the number of banks in 2000 is 11,046.
Where different formulas are used for different ranges of x. In this case, the formula f(x) = 81.9x + 12,364 is used for x < 90, and the formula f(x) = -376.4x + 48,686 is used for x ≥ 90.
This allows us to calculate the number of banks for specific years by substituting the corresponding values of x into the appropriate formula.
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May Term 2022 Online Statistics Homework: 7.3 Interactive Assignment Preparing for Section 7.3 Introduction Objective 1 3.3 ning termally 0 of 1 Point Suppose a sample of Orings wat ottaned and the wall micknek (ninches of each wes recorded the anima probaby po come oma population mais normal Gick here to whetable of cargas, Cack here to vie CE age of the startat omdat 2 of the standart normaln Using the constion coeficient of the nomer probability plot is reasonable to conclude that the pealy bud? Seed the corect thote ban choke (Round to three decimal places as noded) OA Y The combate between the watered the edhe me the com Clear all Help me solve this View an example Get more help- 9 65w 30 points of 6350062007 2218 0228 824 14 0258 120 120 130 Seve 31 Molly douty OE A ring for Section 7.3 Introduction Objective 1 jective 1: Use Normal Probability Plots to Assess Normality 3 Assessing formality 0 of 1 Point Suppose a sample of O-rings was obtained and the wall thickness (in inches) of each was recorded the a nomal probability plot to assess whether the sample come from a population that is normally distributed 2100910 6.257 0716 0229 6743 8244 0254 633 936a bire 0200 301 0331 6338 Click here to view the table of cotical values Click here to view page 1 of the standard normal distribution table Click here to view page 2 of the standard normal distribution table CHO Using the correlation coefficient of the normal probability plot is it reasonable to conclude that the population is normally distributed? Select the comect chocs below and in the ar be with your choice (Round to three decimal places as nooded) ends the val Then his conce that the data come OA. Yes The correlation between the nected scores and the observed dat Clear all Check answer Get more help View an example Help me solve this 50% Mostly doudy BO 14
No, it is not reasonable to conclude that the population is normally distributed based on the correlation coefficient of the normal probability plot.
The correlation coefficient measures the linear relationship between the expected quantiles of a normal distribution and the observed data. If the data points on the plot closely follow the straight line representing the normal distribution, it suggests that the data is normally distributed. However, if the points deviate significantly from the straight line, it indicates departures from normality. The correlation coefficient of a normal probability plot is used to assess whether a sample comes from a normally distributed population. If the points on the plot closely align with the straight line, it suggests normality, while significant deviations indicate departures from normality. In this case, without knowing the actual correlation coefficient value provided in the question, it is not possible to determine whether the data is normally distributed.
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.Information is given about a polynomial f(x) whose coefficients are real numbers. Find the remaining zeros of 1. Degree 3, zeros -6, 8-i The remaining zero(s) of fis(are) (Use a comma to separate answers as needed.)
A polynomial is a sum of two or more than two monomials. It is generally denoted by the symbol p(x), and every polynomial has a degree. The degree of the polynomial is the highest power of its variable.
Given the following data, we are supposed to determine the remaining zeros of the polynomial f(x). Degree 3, zeros -6, 8-i
The polynomial is of degree 3, therefore it will have three zeros. Out of three zeros, one zero is given, and we need to determine the remaining zeros of the polynomial f(x).
We are given that the given polynomial is of degree 3. Also, two zeros are given i.e -6 and 8-i. Therefore, the remaining zero will be the conjugate of the complex zero. This is because the coefficient of the given polynomial is real number, and we know that the complex zeros always occur in conjugate pairs.
Hence, the remaining zeros of the polynomial are 8+i, 8-i.
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5. Given that w=8x^5 3√z^2/√y . The value of x, y and z are measured with maximum percentage error of 1%, 2% and 3%, respectively. Use partial derivatives to find maximum percentage error in w. [5 marks]
To find the maximum percentage error in w, we can use the concept of partial derivatives and the error propagation formula.
Let's denote the variables x, y, and z as x0, y0, and z0, respectively, which represent their true values. And let Δx, Δy, and Δz be the corresponding percentage errors in x, y, and z.
The maximum percentage error in w can be calculated using the formula:
Δw/w = √[(∂w/∂x * Δx/x)^2 + (∂w/∂y * Δy/y)^2 + (∂w/∂z * Δz/z)^2]
Now, let's find the partial derivatives of w with respect to x, y, and z:
∂w/∂x = 40x^4 * 3√(z^2/y)
∂w/∂y = -8x^5 * 3√(z^2/y^3/2)
∂w/∂z = 16x^5 * 3√(z/y)
Substituting these partial derivatives into the error propagation formula, we have:
Δw/w = √[(40x^4 * 3√(z^2/y) * Δx/x)^2 + (-8x^5 * 3√(z^2/y^3/2) * Δy/y)^2 + (16x^5 * 3√(z/y) * Δz/z)^2]
Since we are interested in finding the maximum percentage error, we can assume the worst-case scenario where Δx, Δy, and Δz are all positive. Therefore, we can remove the absolute value signs in the formula.
Finally, to obtain the maximum percentage error, we evaluate the expression Δw/w for the given values of x0, y0, z0, Δx, Δy, and Δz.
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Find the solution to the boundary value problem:
d²y/dt² - 9dy/dt + 18y = 0, y(0) = 5, y(1) = 6
The solution is y= ____
The particular solution to the boundary value problem is: y(t) = c₁[tex]e^{6t}[/tex] + c₂[tex]e^{3t}[/tex]
To solve the given boundary value problem, we can assume a solution of the form y(t) = [tex]e^{rt}[/tex], where r is a constant to be determined.
Differentiating y(t) with respect to t, we have:
dy/dt = r[tex]e^{rt}[/tex]
Differentiating again, we have:
d²y/dt² = r²[tex]e^{rt}[/tex]
Substituting these derivatives into the original differential equation, we get: r²[tex]e^{rt}[/tex] - 9r[tex]e^{rt}[/tex] + 18[tex]e^{rt}[/tex] = 0
Factoring out [tex]e^{rt}[/tex], we have:
[tex]e^{rt}[/tex] (r² - 9r + 18) = 0
For the product to be zero, either [tex]e^{rt}[/tex] = 0 (which is not possible) or (r² - 9r + 18) = 0.
Solving the quadratic equation r² - 9r + 18 = 0, we can use the quadratic formula:
r = (-(-9) ± √((-9)² - 4(1)(18))) / (2(1))
r = (9 ± √(81 - 72)) / 2
r = (9 ± √9) / 2
r = (9 ± 3) / 2
There are two possible values for r:
r₁ = (9 + 3) / 2 = 12 / 2 = 6
r₂ = (9 - 3) / 2 = 6 / 2 = 3
Since we have distinct real roots, the general solution is given by:
y(t) = c₁[tex]e^{r1t}[/tex] + c₂[tex]e^{r2t}[/tex]
To find the specific solution that satisfies the given boundary conditions, we substitute the values y(0) = 5 and y(1) = 6 into the general solution:
y(0) = c₁[tex]e^{r1t}[/tex] + c₂[tex]e^{r2(0)}[/tex] = c₁ + c₂ = 5
y(1) = c₁[tex]e^{r1(1)}[/tex] + c₂[tex]e^{r2(1)}[/tex] = c₁[tex]e^{r1}[/tex] + c₂[tex]e^{r2}[/tex] = 6
We can solve these equations to find the values of c₁ and c₂. Subtracting the first equation from the second, we get:
c₁[tex]e^{r1}[/tex] + c₂[tex]e^{r2}[/tex] - (c₁ + c₂) = 6 - 5
c₁([tex]e^{r1}[/tex] - 1) + c₂([tex]e^{r2}[/tex] - 1) = 1
Using the values r₁ = 6 and r₂ = 3, we have:
c₁(e⁶ - 1) + c₂(e³ - 1) = 1
Unfortunately, we cannot determine the specific values of c₁ and c₂ without more information or numerical methods. Therefore, the solution to the boundary value problem is given by:
y(t) = c₁[tex]e^{6t}[/tex] + c₂[tex]e^{3t}[/tex]
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When calculating the probability P(-1.65 ≤ z ≤ 1.65) under the
Normal Curve
Standard we get:
Select one:
OA. 0.4505
b.0.9010
c.0.9505
OD. 0.0495
The correct answer is option C. 0.9505.
What is the probability range?To calculate the probability between -1.65 and 1.65 under the standard normal curve, we need to find the area under the curve within this range.
Using a standard normal distribution table or a statistical software, we can find the corresponding probabilities for -1.65 and 1.65.
The probability P(-1.65 ≤ z ≤ 1.65) is approximately 0.9505.
Therefore, the correct answer is option C. 0.9505.
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Define a relation R on N by (a,b) e R if and only if - EN. Which of the following properties does R b satisfy?
-Reflexive
-Symmetric
-Antisymmetric
-Transitive
R satisfies all four properties, which are: Reflexive ,Symmetric ,Antisymmetric ,Transitive.
The given relation R on N by (a, b) e R if and only if - EN is the empty relation, which means that no elements in N are related.
Therefore, R satisfies all four properties, which are:
Definition of Reflexive:
A binary relation R on a set A is said to be reflexive if every element of A is related to itself. i.e. (a, a) e R for all a ∈ A.
Definition of Symmetric:
A binary relation R on a set A is said to be symmetric if (a, b) e R implies (b, a) e R for all a, b ∈ A.
Definition of Antisymmetric:
A binary relation R on a set A is said to be antisymmetric if (a, b) e R and (b, a) e R implies that a = b.
Definition of Transitive:
A binary relation R on a set A is said to be transitive if (a, b) e R and (b, c) e R implies (a, c) e R for all a, b, c ∈ A.
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1. Consider the sequence a = {4, 16, 64, 256, 1024,...} a. What is the common ratio? b. What are the next five terms in the sequence? 2. Consider the sequence b= {6, 2, 3, 32, 128, a. What is the comm
The common ratio of a geometric sequence is the factor by which we multiply each term to get the next term. The ratio between two consecutive terms is not constant for this sequence. The sequence is not geometric because there is no constant ratio between two consecutive terms. Therefore, there are no "next five terms" for the sequence.
1. Consider the sequence a = {4, 16, 64, 256, 1024,...}a. The common ratio is 4.
The common ratio of a geometric sequence is the factor by which we multiply each term to get the next term. The ratio between two consecutive terms is the same, 4, so we say that the common ratio is 4.
b. The next five terms in the sequence are: 4096, 16384, 65536, 262144, 1048576.2. Consider the sequence b = {6, 2, 3, 32, 128,...}a. The common ratio is 16.
The common ratio of a geometric sequence is the factor by which we multiply each term to get the next term. The ratio between two consecutive terms is not constant for this sequence.
6 ÷ 2
= 3,
2 ÷ 3
= 0.67,
3 ÷ 32 ≈ 0.0938,
32 ÷ 128
= 0.25.
The sequence is not geometric because there is no constant ratio between two consecutive terms. Therefore, there are no "next five terms" for the sequence.
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The manufacturer of a new chewing gum claims that at least 80% of dentists surveyed prefer their type of gum andrecommend it for their patients who chew gum. An independent consumer research firm decides to test their claim. The findings in a sample of 200 dentists indicate that 74.1% of the respondents do actually prefer their gum.
A. What are the null and alternative hypotheses for the test?
B. What is the decision rule?
C. The value of the test statistic is:
a. The null and alternative hypotheses are;
[tex]H_0: p \geq 0.80\\H_1: p < 0.80[/tex]
b. The decision rule is to reject the null hypothesis
c. The test statistic is -2.16
What are the null and alternative hypotheses for test?A. The null and alternative hypotheses for the test are:
[tex]H_0: p \geq 0.80\\H_1: p < 0.80[/tex]
where p is the proportion of dentists who prefer the new chewing gum.
B. The decision rule is to reject the null hypothesis if the p-value is less than or equal to the significance level, α
C. The value of the test statistic is:
[tex]$z = \frac{p - \hat{p}}{\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}} = -2.16$[/tex]
where p is the sample proportion of dentists who prefer the new chewing gum, and n is the sample size.
The p-value is the probability of observing a test statistic at least as extreme as the one observed, assuming that the null hypothesis is true. In this case, the p-value is 0.0307.
Since the p-value is less than 0.05, we reject the null hypothesis and conclude that there is evidence to suggest that the proportion of dentists who prefer the new chewing gum is less than 80%.
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Two students graphed the system y= ½ x + 6 y = 2x + 9 They found different solutions student 1s solution: (10,2) Student 2's solution: (-2,5) who was correct?
Answer:
Student 2's is correct
Step-by-step explanation:
(I did this with algebra not graphing btw)
Just substitute the points for both equations, and if they're both true it's the answer:
Student 1 (10,2):
y = 1/2x + 6
2 = 1/2(10) + 6
2 = 5 + 6
2 = 11
Since this is already false, this answer is false
Student 2:
y = 1/2x + 6
5 = (1/2)(-2) + 6
5 = -1 + 6
5 = 5
True, now move onto the next equation
y = 2x +9
5 = (2)(-2) + 9
5 = -4 + 9
5 = 5
Also true, which means Student 2 is correct.
Find c satisfying the Mean Value Theorem for integrals with f(x), g(x) in the interval [0, 1]. a) f(x) = x, g(x) = x b) f(x) = x², g(x) = x c) f(x)=x, g(x) = ex
Te value of c which satisfies the mean value theorem for integrals with f(x)=x and g(x)=ex in the interval [0, 1] is c= 1/2.
So, the answer is C
We need to find c that satisfies the mean value theorem for integrals.
Let's solve the problem by applying the mean value theorem for integrals.
Mean Value Theorem for Integrals:
If f(x) is a continuous function on the closed interval [a, b], then there exists at least one number c in the interval (a, b) such that:
f(c) = (1/(b-a))∫[a,b]f(x)dx
We have to find such a number c.⇒ f(x) = x and g(x) = ex, in the interval [0, 1].∴ f(x) and g(x) are continuous in the closed interval [0, 1].∴ f(x) and g(x) are also continuous in the open interval (0, 1).
Let's calculate the integral using the formula of the mean value theorem.∴ (1/(b-a))∫[a,b]f(x)dx = f(c)∴ (1/(1-0))∫[0,1] xdx = f(c)∴ ∫[0,1] xdx = f(c)∴ (x²/2) [from 0 to 1] = f(c)∴ [1²/2 - 0²/2] = f(c)∴ 1/2 = f(c)∴ c = 1/2
Therefore, the value of c which satisfies the mean value theorem for integrals with f(x)=x and g(x)=ex in the interval [0, 1] is c= 1/2.
Hence, option C is correct.
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Write the equation of the line with the given slope and the given y-intercept. Leave the answer in slope-intercept form. 7 Slope, y-intercept (0, -6) What is the equation of the line? 0 (Simplify your answer)
The equation: gives the linear equation's slope-intercept form i.e. y = mx + b. This form uses "m" to denote the line's rate of change, which shows how much the y-coordinate shifts with each unit increase in the x-coordinate. The slope controls the line's steepness and direction.
When graphing linear equations and determining a line's slope and y-intercept rapidly, the slope-intercept form is especially helpful. It offers a clear and understandable illustration of a linear relationship between the variables.
The equation of the line with the given slope 7 and the given
y-intercept (0, -6) is
y = 7x - 6. The equation of the line in slope-intercept form is
y = mx + b, where m is the slope and b is the y-intercept.
Given that the slope is 7 and the y-intercept is (0, -6), we can substitute those values into the equation to get:
y = 7x - 6. Therefore, the equation of the line is
y = 7x - 6.
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a. A capacitor (C) which is connected with a resistor (R) is being charged by supplying the constant voltage (V) of (T+5)v. The thermal energy dissipated by the resistor over the time is given as 2 E = 5,0P(e) dt, where P(t) = CS e-d) R. Find the energy dissipated. RC (10 Marks)
Given that:A capacitor (C) which is connected with a resistor (R) is being charged by supplying the constant voltage (V) of (T+5)v.
The thermal energy dissipated by the resistor over the time is given as 2E = 5,0P(e) dt,
where P(t) = CS e-d) R.To find:The energy dissipated using RC.
We know that the energy dissipated is given by the formula:E = 1/2 CV^2
From the above given formula,
we can writeV = T + 5Therefore,E = 1/2 CT^2 + 5CT + 25C.....(i)
We are also given the thermal energy dissipated by the resistor over the time is given as 2 E = 5,0P(e) dt,
where P(t) = CS e-d) R.2E = 5,0 ∫0∞[CSe-2tR] R dt
Using integration by substitution, t = u/2, dt = du/22E = 5,0 ∫0∞[CSe-u/RC] (R/2) du
Substituting the given value P(t) = CS e-d) R into the above equation2E = 5,0 [P(u/2)]du/2
[tex]Substituting the value of P(t) = CS e-d) R into the above equation,2E = 5,0 [(CS e-2u/RC) R]du/2 = 5,0 [S e-2u/RC]du/2[/tex]
Now, substituting this value of 2E in equation (i),5,0 [S e-2u/RC]du = 1/2 CT^2 + 5CT + 25C
Thus, the energy dissipated using RC is 1/10RC.
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An agent claims that there is no difference between the average pay of safeties and linebackers in a Pro League. A survey of 15 safeties found an average salary of $501,580, and a survey of 15 linebackers found an average salary of $513,360. If the standard deviation in the first sample is $20,000 and the standard deviation in the second sample is $18,000, is the agent correct? Use a=0.01. Assume the population variances are not equal. You are required to do the "Seven-Steps Classical Approach as we did in our class". No credit for p-value test. 1. Define: 2. Hypothesis: 3. Sample: 4. Test: 5. Critical Region: 6. Computation: 7. Decision:
1. Let μ₁ be the population mean salary of safeties, and μ₂ be the population mean salary of linebackers.
2. Null hypothesis (H0): μ1 = μ2 (There is no difference between the average pay of safeties and linebackers.)
Alternative hypothesis (H1): μ1 ≠ μ2 (There is a difference between the average pay of safeties and linebackers.)
3. For safeties: n₁ = 15, [tex]\bar{X_1}[/tex] = $501,580, σ₁ = $20,000
For linebackers: n₂ = 15,[tex]\bar{X_2}[/tex] = $513,360, σ₂ = $18,000
4. We will use the two-sample t-test for independent samples to test the hypothesis.
5. the critical t-value is approximately ±2.763.
6. the test statistic (t-value) is - 1.680
7. the calculated t-value (-1.680) does not fall within the critical region of ±2.763, we fail to reject the null hypothesis.
1. Define:
Let μ₁ be the population mean salary of safeties, and μ₂ be the population mean salary of linebackers.
Let [tex]\bar{X_1}[/tex] be the sample mean salary of safeties, [tex]\bar{X_2}[/tex] be the sample mean salary of linebackers.
Let n₁ be the sample size of safeties (15), n₂ be the sample size of linebackers (15).
Let σ₁ be the standard deviation of safeties ($20,000), and σ₂ be the standard deviation of linebackers ($18,000).
2. Hypothesis:
Null hypothesis (H0): μ1 = μ2 (There is no difference between the average pay of safeties and linebackers.)
Alternative hypothesis (H1): μ1 ≠ μ2 (There is a difference between the average pay of safeties and linebackers.)
3. Sample:
For safeties: n₁ = 15, [tex]\bar{X_1}[/tex] = $501,580, σ₁ = $20,000
For linebackers: n₂ = 15,[tex]\bar{X_2}[/tex] = $513,360, σ₂ = $18,000
4. Test:
We will use the two-sample t-test for independent samples to test the hypothesis.
5. Critical Region:
Since the significance level (α) is given as 0.01, we will use a two-tailed test.
Using a t-table or t-distribution calculator with α/2 = 0.01/2 = 0.005 and degrees of freedom df = n₁ + n₂ - 2 = 15 + 15 - 2 = 28, the critical t-value is approximately ±2.763.
6. Computation:
Calculate the test statistic (t-value) using the formula:
t = ([tex]\bar{X_1}-\bar{X_2}[/tex]) / √((σ₁² / n₁) + (σ₂² / n₂))
t = ($501,580 - $513,360) / √((($20,000²) / 15) + (($18,000²) / 15))
t = -11680 / √((400000000 / 15) + (324000000 / 15))
t ≈ -11680 / √(26666666.67 + 21600000)
t ≈ -11680 / √(48266666.67)
t ≈ -11680 / 6949.89
t ≈ -1.680
7. Decision:
Since the calculated t-value (-1.680) does not fall within the critical region of ±2.763, we fail to reject the null hypothesis. Therefore, based on the sample data, we do not have sufficient evidence to conclude that there is a significant difference between the average pay of safeties and linebackers in the Pro League.
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What Is Log, 18 + 2log4 3 Written As A Single Logarithm?
(A) Log, 2
(B) Log, 24
(C) Log4 27
(D) Log4 162
The given expression 18 + 2log₄ 3 can be written as a single logarithm as log₄ (4¹⁸ × 3²) or log₄ 162. So, the answer is option (D) Log₄ 162.
The given expression 18 + 2log₄ 3 can be written as a single logarithm using the following logarithmic identity:
logₐ b + logₐ c = logₐ bc
This identity tells us that the sum of two logarithms with the same base is equal to the logarithm of their product. Using this identity, we can write:18 + 2log₄ 3 = log₄ (4¹⁸ × 3²)
Simplifying the expression within the logarithm, we get:
log₄ (4¹⁸ × 3²) = log₄ (4¹⁸) + log₄ (3²)
Using the identity logₐ bⁿ = n logₐ b, we can simplify further:
log₄ (4¹⁸) + log₄ (3²) = 18log₄ 4 + 2log₄ 3
Since log₄ 4 = 1, we get: 18log₄ 4 + 2log₄ 3 = 18 + 2log₄ 3
Therefore, the given expression 18 + 2log₄ 3 is equivalent to log₄ (4¹⁸ × 3²) or log₄ 162. So, the answer is option (D) Log₄ 162.
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1) Find the parametric and cartesian form of the singular solution of the DE yy'=xy¹2+2. 2) Find the general solution of the DE y=2+y'x+y'2. 3) Find the general solutions of the following DES a) yv-2yIv+y"=0 b) y"+4y=0 4) Find the general solution of the DE y"-3y'=e3x-12x.
The general solution of the differential equation y" - 3y' = e^(3x) - 12x is y = C1e^(3x) + C2e^(-x) + 2x^2 - 8x - 4, where C1 and C2 are arbitrary constants. The singular solution of the first differential equation is given in both parametric and cartesian forms.
The general solutions of the second and third differential equations are provided. Finally, the general solution of the fourth differential equation is given, which includes exponential and polynomial terms.
1) The singular solution of the differential equation yy' = xy^2 + 2 can be expressed in parametric form as x = t^2 - 2 and y = t^3 - 3t + 2. In cartesian form, it is given by y = (x^3 - 6x + 8)^(1/3) - x.
2) The general solution of the differential equation y = 2 + y'x + (y')^2 is y = x^2 + 2x + C, where C is an arbitrary constant.
3) a) The general solution of the differential equation yv - 2yIv + y" = 0 is y = C1e^x + C2e^(-x), where C1 and C2 are arbitrary constants.
b) The general solution of the differential equation y" + 4y = 0 is y = C1cos(2x) + C2sin(2x), where C1 and C2 are arbitrary constants.
4) The general solution of the differential equation y" - 3y' = e^(3x) - 12x is y = C1e^(3x) + C2e^(-x) + 2x^2 - 8x - 4, where C1 and C2 are arbitrary constants.
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Scores on a certain test are normally distributed with a mean of 84 and a standard deviation of 5. Find: the percentage of test scores that are above 87 the percentage of test scores that are between 77 and 87 above 87: 27.4% between 77 and 87: 8.1% O above 87: 72.6% between 77 and 87: 91.9% above 87: 27.4% between 77 and 87: 91.9% above 87: 27.4% between 77 and 87: 64.5% above 87: 8.1% between 77 and 87: 64.5% O OO
the percentage of test scores between 77 and 87 is 64.5%.
To find the percentage of test scores that are above a certain value or between two values in a normal distribution, we can use the Z-score and the standard normal distribution table.
a) Percentage of test scores above 87:
First, we need to calculate the Z-score for the value 87 using the formula:
Z = (X - μ) / σ
where X is the value, μ is the mean, and σ is the standard deviation.
Z = (87 - 84) / 5
Z = 0.6
Using the standard normal distribution table or calculator, we can find the percentage corresponding to a Z-score of 0.6. The table indicates that the percentage is approximately 72.6%.
Therefore, the percentage of test scores above 87 is 72.6%.
b) Percentage of test scores between 77 and 87:
We need to calculate the Z-scores for the values 77 and 87 using the same formula as above.
For 77:
Z = (77 - 84) / 5
Z = -1.4
For 87:
Z = (87 - 84) / 5
Z = 0.6
Using the standard normal distribution table or calculator, we can find the percentages corresponding to the Z-scores of -1.4 and 0.6, respectively. The table indicates that the percentage corresponding to -1.4 is approximately 8.1% and the percentage corresponding to 0.6 is approximately 72.6%.
To find the percentage between these two values, we subtract the smaller percentage from the larger percentage:
Percentage between 77 and 87 = 72.6% - 8.1%
Percentage between 77 and 87 = 64.5%
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