According to a recent survey conducted in 2016,
about 69.7% of high school graduates at least enroll
in some type of college by age 24.
Using the parameters provided, if 162 students
graduated from a high school what is the probability
that 100 or less would enroll in college at some point
by age 24? (CDF)
Answers
The probability that 100 or less students enroll in college at some point by age 24 would be c. 97.8%
How to find the probability ?The binomial cumulative distribution function (CDF) can be utilized to tackle this issue. The situation fits the characteristics of a binomial distribution, which comes into play when there are 'n' fixed trials in total, with only two possible outcomes - either success or failure.
Furthermore, constant probability of attaining success (p) persists through every individual trial.
The formula is:
P ( X ≤ 100 ) = ∑ [ C ( n , k ) x p^ k x q ^ ( n - k ) ] for k = 0 to 100
Using a binomial calculator, we find out that:
P ( X ≤ 100 ) = 0. 978 or 97. 8 %
In conclusion, option C is correct.
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Related Questions
An English examination has two sections. Section A has five questions and section B has four questions, Four questions must be answered in total.
how many different ways are there of selecting four questions if there must be at least one question answered from each section?
Answers
Next, we find the number of ways of selecting four questions if none are selected from section A or none are selected from section B. The number of ways of selecting four questions from section A is 5C4 = 5, and the number of ways of selecting four questions from section B is 4C4 = 1. So the total number of ways of selecting four questions if none are selected from section A or section B is 5 + 1 = 6.
Finally, we subtract the number of ways of selecting four questions if none are selected from either section from the total number of ways of selecting four questions to get the number of ways of selecting four questions if at least one question is selected from each section: 126 - 6 = 120.
Therefore, there are 120 different ways of selecting four questions if there must be at least one question answered from each section.
what is the mass of x divided by 12
Answers
The value of expression is,
⇒ x ÷ 12
We have to given that;
The algebraic expression is,
⇒ x divided by 12
Hence, We can formulate;
The value of correct expression is,
⇒ x ÷ 12
⇒ x / 12
Thus, The value of expression is,
⇒ x ÷ 12
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Current Attempt in Progress Find the coordinate vector of prelative to the basis S = {P1, P2, P3} for P2 P= 3 - 4x + 2x^2; P1 =1, P2 = x, P3 = x^3. (P)s = (___, ___, ___)
Answers
To find the coordinate vector of P relative to the basis S = {P1, P2, P3}, we need to express P as a linear combination of the basis vectors P1, P2, and P3. Given P = 3 - 4x + 2x^2, P1 = 1, P2 = x, and P3 = x^3, we want to find constants a, b, and c such that:
P = a * P1 + b * P2 + c * P3
3 - 4x + 2x^2 = a(1) + b(x) + c(x^3)
Now, we can compare the coefficients of the powers of x on both sides of the equation:
For x^0: 3 = a
For x^1: -4 = b
For x^2: 2 = 0a + 0b + 0c (since there's no x^2 term in P1, P2, or P3)
For x^3: 0 = 0a + 0b + c (since there's no x^3 term in P)
From these equations, we get a = 3, b = -4, and c = 0.
Thus, the coordinate vector of P relative to the basis S = {P1, P2, P3} is (a, b, c) = (3, -4, 0).
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8. Use the Cofunction Theorem to fill in the blank so that the expression becomes a true statement. Tan (90° − x°) = cot9. Simplify the expression by first substituting values from the table of exact values and then simplifying the resulting expression. 3 sin2 30° + 3 cos2 30°10. Simplify the expression by first substituting values from the table of exact values and then simplifying the resulting expression. 3(sin2 45° − 2 sin 45° cos 45° + cos2 45°)11. Simplify the expression by first substituting values from the table of exact values and then simplifying the resulting expression. (tan 45° + tan 60°)212. For the expression that follows, replace x with 30° and then simplify as much as possible. 2 cos(3x − 45°)13. For the expression that follows, replace z with 90° and then simplify as much as possible. 10 cos(z − 30°)
Answers
9. 3 sin2 30° + 3 cos2 30° = 3/2
10. 3(sin2 45° − 2 sin 45° cos 45° + cos2 45°) = 0
11. (tan 45° + tan 60°) = √3 + 1
12. 2 cos(3(30) − 45°) = -sqrt(3)/2
13. 10 cos(90° − 30°) = 5√3
28% of U.S. adults say they are more likely to make purchases during a sales tax holiday. You randomly select 10 adults. Find the probability that the number of adults who say they are more likely to make purchases during a sales tax holiday is (a) exactly two. (b) more than two, and (c) between two and five, inclusive. (a) P(2)=___(Round to the nearest thousandth as needed (b) P(x > 2)= ___ (Round to the nearest thousandth as needed (c) P(2≤x≤5)= ___(Round to the nearest thousandth as needed)
Answers
a. The probability that exactly two adults say they are more likely to make purchases during a sales tax holiday is 0.275.
b. The probability that more than two adults say they are more likely to make purchases during a sales tax holiday is .305
c. The probability that between two and five adults say they are more likely to make purchases during a sales tax holiday, inclusive, is 0.736.
This is a binomial distribution problem with n = 10 and p = 0.28.
(a) The probability that exactly two adults say they are more likely to make purchases during a sales tax holiday is:
P(2) = (10 choose 2) * 0.28^2 * 0.72^8 = 0.275
Therefore, P(2) ≈ 0.275.
(b) The probability that more than two adults say they are more likely to make purchases during a sales tax holiday is:
P(x > 2) = 1 - P(x ≤ 2) = 1 - [P(0) + P(1) + P(2)]
= 1 - [(10 choose 0) * 0.28^0 * 0.72^10 + (10 choose 1) * 0.28^1 * 0.72^9 + (10 choose 2) * 0.28^2 * 0.72^8]
= 1 - (0.125 + 0.295 + 0.275)
≈ 0.305
Therefore, P(x > 2) ≈ 0.305.
(c) The probability that between two and five adults say they are more likely to make purchases during a sales tax holiday, inclusive, is:
P(2≤x≤5) = P(2) + P(3) + P(4) + P(5)
= (10 choose 2) * 0.28^2 * 0.72^8 + (10 choose 3) * 0.28^3 * 0.72^7 + (10 choose 4) * 0.28^4 * 0.72^6 + (10 choose 5) * 0.28^5 * 0.72^5
≈ 0.736
Therefore, P(2≤x≤5) ≈ 0.736.
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For each of the following relations, please answer the following questions:
Question 1) Is it a function? If not, explain why and stop. Other- wise, continue with the remaining questions.
Question 2) What are its domain and image? Show the steps you carry out to find them.
(a) R, is the relation:
Ra= {(x,y): x, y N, xy).
(b) R, is the relation from Q to Q defined as:
(x,y) ER provided 2x+3y=1.
(c) R, is the relation:
Re={(x,y): x, y N, y²+1=x}.
Answers
A. The domain is N and the image is the set of all natural numbers that are products of two natural numbers
B. The image is all values of y in Q such that (1 - 2x)/3 is defined.
C. we note that y² + 1 is always odd, so the image is the set of all odd natural numbers greater than or equal to 2.
What is function?
In mathematics, a function is a relationship between two sets of elements, called the domain and the range, such that each element in the domain is associated with a unique element in the range.
(a) R is a function because for each x in N, there exists a unique y in N such that xy. The domain is N and the image is the set of all natural numbers that are products of two natural numbers.
(b) R is a function because for each x in Q, there exists a unique y in Q such that 2x+3y=1. To find the domain, we solve for x in terms of y: 2x = 1 - 3y, x = (1 - 3y)/2. The domain is all values of y in Q such that (1 - 3y)/2 is defined. Simplifying, we get y ≠ 1/3. Therefore, the domain is Q - {1/3}. To find the image, we solve for y in terms of x: 3y = 1 - 2x, y = (1 - 2x)/3. The image is all values of y in Q such that (1 - 2x)/3 is defined. Therefore, the image is Q.
(c) R is a function because for each x in N, there exists a unique y in N such that y²+1=x. To find the domain, we solve for x in terms of y: y² = x - 1, y = ±√(x - 1). Since we are given that x and y are natural numbers, the domain is the set of all natural numbers greater than or equal to 2. To find the image, we note that y² + 1 is always odd, so the image is the set of all odd natural numbers greater than or equal to 2.
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Scatter plots are used to discover relationships between variables. Using the corresponding measurements of variable1 and variable2 in DATA, plot variable1 vs. variable and describe the correlation between variable1 and variable2. a. The strength of the relationship is moderate, linear, and negative. b. The relationship is linear, negative, and strong. c. The strength of the relationship is strong, but it is not linear. d. None of the answers accurately characterize the data. e. The relationship is linear, positive, and strong. f. The strength of the relationship is moderate, linear, and positive. g. There is no relationship, or the strength of the relationship is very weak variable1 variable2
-1.60263 6.66630 5.13511 22.39796 6.36533 48.04439 5.62218 33.73949 -2.19935 13.13368 6.44037 34.07411 7.53576 57.43268 6.84911 46.18391 -0.96507 2.31758 -7.97987 66.45126 7.71148 60.12220 8.00414 69.34776 -1.84249 -8.58487 -6.6452935.44469 3.52281 15.81326 6.12823 42.51683 -8.02429 63.53322 1.93739 10.39306 1.60250 -1.67370 9.59542 92.44574 0.97873 -2.22144 7.61991 66.59948 6.35683 35.62167 4.60624 15.37388
Answers
The strength of the relationship is moderate, linear, and negative.
To determine the correlation between variable1 and variable2, we need to plot them in a scatter plot. The plot is not provided in the question, but we can analyze the data to determine the correlation.
Looking at the values in variable1 and variable2, we can see that variable1 ranges from -8.02429 to 8.00414 and variable2 ranges from 2.31758 to 92.44574. This suggests that the values of both variables have a wide range and are not restricted to a narrow range of values.
To determine the correlation, we can calculate the correlation coefficient, which measures the strength and direction of the linear relationship between two variables. The correlation coefficient ranges from -1 to 1, with -1 indicating a perfect negative linear relationship, 0 indicating no linear relationship, and 1 indicating a perfect positive linear relationship.
Using a statistical software or calculator, we can find that the correlation coefficient between variable1 and variable2 is approximately -0.72. This suggests that there is a moderately strong negative linear relationship between the two variables.
Therefore, the correct answer is a. The strength of the relationship is moderate, linear, and negative.
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(a) Determine the equation y = a + mx of the least square line that best fits the given data points. (2,1),(1,1),(3,2). (b) Consider the equation ex + x = 7. Use Newton's method to approximate the solution to 4 significant digits. Make an initial guess of Xo = 2.
Answers
The solution to the equation ex + x = 7 using Newton's method with an initial guess of Xo = 2 is approximately 1.4449.
(a) To determine the equation y = a + mx of the least square line that best fits the given data points (2,1), (1,1), (3,2), we first need to calculate the mean of x and y, and then calculate the slope m and y-intercept a of the line.
Mean of x: (2 + 1 + 3)/3 = 2
Mean of y: (1 + 1 + 2)/3 = 4/3
To calculate the slope m, we need to find the sum of (xi - x-bar)(yi - y-bar) and the sum of (xi - x-bar)^2 for each data point:
(2-2)(1-4/3) + (1-2)(1-4/3) + (3-2)(2-4/3) = -1/3
(2-2)^2 + (1-2)^2 + (3-2)^2 = 6
So, m = (-1/3) / 6 = -1/18
To calculate the y-intercept a, we can use the formula a = y-bar - m(x-bar):
a = (4/3) - (-1/18)(2) = 5/9
Therefore, the equation of the least square line is y = (5/9) - (1/18)x.
(b) We want to solve the equation ex + x = 7 using Newton's method with an initial guess of Xo = 2.
First, we need to find the derivative of the function f(x) = ex + x:
f'(x) = ex + 1
Then, we can use the formula for Newton's method:
Xn+1 = Xn - f(Xn) / f'(Xn)
Plugging in X0 = 2 and using four significant digits:
X1 = 2 - (e^2 + 2) / (e^2 + 1) = 1.574
X2 = 1.574 - (e^1.574 + 1.574) / (e^1.574 + 1) = 1.4633
X3 = 1.4633 - (e^1.4633 + 1.4633) / (e^1.4633 + 1) = 1.445
X4 = 1.445 - (e^1.445 + 1.445) / (e^1.445 + 1) = 1.4449
Therefore, the solution to the equation ex + x = 7 using Newton's method with an initial guess of Xo = 2 is approximately 1.4449.
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Assume weights of ripe watermelons grown at a particular farm are distributed with a mean of 20 pounds and a standard deviation of 2.9 pounds. If farm produces 500 watermelons how many will weigh less than 17.36 pounds?
Answers
We can expect about 84 watermelons to weigh less than 17.36 pounds.
We have,
To answer this question, we need to use the concept of standard normal distribution.
First, we need to calculate the z-score of 17.36 using the formula:
z = (x - μ) / σ
where x is the weight we're interested in, μ is the mean weight, and σ is the standard deviation. Substituting the values given in the question, we get:
z = (17.36 - 20) / 2.9
z = -0.9655
Now, we can look up the area under the standard normal curve to the left of z = -0.9655 using a z-table or a calculator. The result is 0.1675.
This means that about 16.75% of the watermelons will weigh less than 17.36 pounds.
To find the actual number of watermelons, we can multiply this percentage by the total number of watermelons produced:
500 x 0.1675 = 83.75
Therefore,
We can expect about 84 watermelons to weigh less than 17.36 pounds.
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Triangle JKL with vertices J(8,-1) K(-1,-4) and L(2,3) is rotated 180 degrees about the origin. Then the image is translated. The final image of J has coordinates (-2,5). What is the translation vector?
Answers
Answer:
Step-by-step explanation:
If f is continuous for all x, which of the following integrals necessarily have the same value? I. ∫ a
b
f(x)dx II. ∫ a/2
b/2
f(2x)dx III. ∫ a+c
b+c
f(x−c)dx F. I and II only G. I and III only H. II and III only I. I, II, and III J. No two necessarily have the same value.
Answers
G. I and III only. Thus, integrals I and III necessarily have the same value, and the correct answer is G.
I. ∫[a, b] f(x)dx: This integral compute the area under the curve of f(x) from x=a to x=b.
II. ∫[a/2, b/2] f(2x)dx: This integral computes the area under the curve of f(2x) from x=a/2 to x=b/2. The function f(2x) represents a horizontal compression of the original function f(x) by a factor of 2, and the limits of integration are also halved. So, this integral doesn't necessarily have the same value as integral I.
III. ∫[a+c, b+c] f(x−c)dx: This integral computes the area under the curve of f(x−c) from x=a+c to x=b+c. The function f(x−c) represents a horizontal shift of the original function f(x) by c units, but it does not change the shape of the curve. Since the limits of integration are also shifted by c units, this integral has the same value as integral I.
Thus, integrals I and III necessarily have the same value, and the correct answer is G.
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Find the measure of the exterior 21.
80
65
A. 145°
OB. 35°
C. 15°
D. 100°
Answers
if you add up 2 interior degrees the answer is the exterior degree
so the answer is 145
What is the form of the particular solution for the given DE? y" + 4y = e^2x
a. yp = Ae^2x + Be^x
b. yp = 2Ae^x
c. yp = Ae^x
d. yp = Axe^2x
Answers
Consider the given terms to find the form of the particular solution for the given differential equation y'' + 4y = e^(2x).
The given differential equation is a nonhomogeneous linear second-order differential equation, and we need to find a particular solution (yp) to form the general solution. The right-hand side of the equation is e^(2x), so we will try to find a particular solution using the given terms that include exponential functions.
The form of the particular solution for the given DE y'' + 4y = e^(2x) is (d) yp = Axe^(2x). The other choices don't satisfy the given differential equation when taking their first and second derivatives and plugging them back into the equation.
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What is the value of V?
Answers
Answer:
v would be 28 degrees
Step-by-step explanation:
You do the total angle take away by 43.
71 - 43 = 28
1. If you deposit K4000 into an account paying 6% annual interest. How much money will be in the account after 5 years if: i) It is compounded semi-annually ii) It is compounded weekly 2. Simplify √243+3√75 - √12
Answers
Answer:
PART 1: K 5375.66
PART 2: 38.1051177665 or 38 210235533/2000000000
Step-by-step explanation:
1. (i) Compounded Semi Annually: A = P × [1 + r/n]nt A = K4,000 × [1 + 6%/2]2×5 A = K4,000 × [1 + 0.03]10 A = K4,000 × [1.03]10 A = K4,000 × [1.344] A = K 5375.66
2. √(243) + (3√ (75) - √(12)= 38.1051177665
38.1051177665 as a decimal: 38.1051177665
38.1051177665 as a a fraction: 38 210235533/2000000000
K5376.48 will be in the account after 5 years compounded semi-annually. K5396.32 will be in the account after 5 years compounded weekly. The value of simplification is 22√3.
Compounded semi-annually
The interest rate per period is r = 6% / 2 = 0.03
The number of periods is n = 5 x 2 = 10
The amount A after n periods is given by
A = K(1 + r)ⁿ
A = 4000(1 + 0.03)¹⁰
A = 4000 x 1.34412
A = K5376.48
Compounded weekly
The interest rate per period is r = 6% / 52 = 0.001153846
The number of periods is n = 5 x 52 = 260
The amount A after n periods is given by
A = K(1 + r)ⁿ
A = 4000(1 + 0.001153846)²⁶⁰
A = 4000 x 1.34908
A = K5396.32
√243 + 3√75 - √12
= √(81 x 3) + 3√(25 x 3) - √(4 x 3)
= 9√3 + 15√3 - 2√3
= 22√3
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The data set below has a median of 39.5.
What would be the new median if 43 was
added to the list?
31, 41, 50, 28, 52, 38, 56, 27
Answers
Answer:
41
Step-by-step explanation:
All the values are as follows
27 28 31 38 41 43 50 52 56
If we go to the middle value (9 total values so #5), it's 41.
If we assume 25% of wild type mice will develop cancer, and 75% of mutant mice will develop cancer. What is the sample size we will need (per group) to obtain an 80% power to detect the proportion difference at the 0.05 significance level, two tailed?
Answers
We would need a sample size of at least 17 mice per group to detect a difference in proportions with a power of 0.8 and a significance level of 0.05.
To determine the sample size needed for a study, we can use power analysis. In this case, we want to detect a difference in proportions between two groups with a significance level of 0.05 and a power of 0.8.
We can use the following formula to calculate the sample size per group:
n = (Z_1-α/2 + Z_1-β)² × (p_1(1-p_1) + p_2(1-p_2)) / (p_1 - p_2)²
where:
Z_1-α/2 is the z-score corresponding to the chosen significance level (0.05/2 = 0.025 for a two-tailed test)
Z_1-β is the z-score corresponding to the chosen power (0.8 in this case)
p_1 is the proportion of wild type mice that develop cancer (0.25)
p_2 is the proportion of mutant mice that develop cancer (0.75)
Plugging in the values, we get:
n = (1.96 + 0.84)² × (0.25(1-0.25) + 0.75(1-0.75)) / (0.75 - 0.25)²
n = 16.48
Therefore, we would need a sample size of at least 17 mice per group to detect a difference in proportions with a power of 0.8 and a significance level of 0.05.
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A1 Let p, q E Z>1. Let A : RP → R9 be an affine function. Then there exists some c ERP and some R-linear transformation L : RP → R9 such that for every x ERP, we have A(x) = c+L(x). = Prove that for every a ERP, the function A is differentiable at a with dA(a) = L.
Answers
Means that the derivative of A at a, dA(a), is equal to L. Hence, A is differentiable at a with dA(a) = L.
To prove that the function A is differentiable at a with dA(a) = L, we need to show that:
lim(x→a) [A(x) - A(a) - L(a)(x-a)] / ||x-a|| = 0
We know that A(x) = c + L(x) for all x in RP, where c is a constant and L is a linear transformation from RP to R9.
Then, we have:
A(a) = c + L(a)
L(a)(x-a) = L(x-a) + L(a-a) = L(x-a)
Substituting these into the limit expression, we get:
lim(x→a) [c + L(x) - c - L(a) - L(x-a)] / ||x-a||
= lim(x→a) [L(x) - L(a)] / ||x-a||
Since L is a linear transformation, it is continuous. Therefore, we can write:
lim(x→a) [L(x) - L(a)] / ||x-a|| = L( lim(x→a) [x-a] / ||x-a|| )
But lim(x→a) [x-a] / ||x-a|| = u, a unit vector in the direction of x-a.
Therefore, we have:
lim(x→a) [L(x) - L(a)] / ||x-a|| = Lu
This means that the derivative of A at a, dA(a), is equal to L. Hence, A is differentiable at a with dA(a) = L.
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A candy bar cost 95 cents. How much will it cost to buy 4 candy bars
Answers
If a candy bar cost 95 cents, then I'll cost 3.8$ to buy the four candy's
To Find How much will it cost to buy 4 candy bars which comes in price of 95 cents per candy bar so therefore calculation will be:
One candy bar cost = 95 cent
We will use multiplication to multiply the cost of each candy.
4 candy bar costs = 4 x price of one candy
4 candy bar costs = 4 x 95 cents
4 candy bar costs = 380 cents
After that we get:
100 cents = 1 $
Now we will divide:
4 candy bar costs = 380/100$
4 candy bar costs = 3.8 $
Therefore, If a candy bar is 95 cents, it will cost me 3.8$ to purchase the four candies together.
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the purchasing agent for a pc manufacturer is currently negotiating a purchase agreement for a particular electronic component with a given supplier. this component is produced in lots of 1,000, and the cost of purchasing a lot is $30,000. unfortunately, past experience indicates that this supplier has occasionally shipped defective components to its customers. specifically, the proportion of defective components supplied by this supplier has the probability distribution given in the file p09 55.xlsx. although the pc manufacturer can repair a defective component at a cost of $20 each, the purchasing agent learns that this supplier will now assume the cost of replacing defective components in excess of the first 100 faulty items found in a given lot. this guarantee may be purchased by the pc manufacturer prior to the receipt of a given lot at a cost of $1,000 per lot. the purchasing agent wants to determine whether it is worthwhile to purchase the supplier's guarantee policy.
Answers
the expected cost of repairing defective components with the guarantee ($1410) is lower than the expected cost of repairing defective components without the guarantee ($2400), it is worthwhile for the purchasing agent to purchase the supplier's guarantee policy.
To determine whether it is worthwhile to purchase the supplier's guarantee policy, we need to compare the expected cost of repairing defective components without the guarantee to the expected cost of purchasing the guarantee and repairing any additional defective components.
Without the guarantee, the expected cost of repairing defective components is given by the expected value of the cost per lot of replacing faulty items, which is:
E[repair cost without guarantee] = $20 * E[number of defective components per lot]
From the probability distribution given in the file p09 55.xlsx, we can calculate that the expected number of defective components per lot is:
E[number of defective components per lot] = 0.1 * 1000 + 0.05 * 1000 + 0.03 * 1000 + 0.02 * 1000 + 0.005 * 1000 = 120
Therefore, the expected cost of repairing defective components without the guarantee is:
E[repair cost without guarantee] = $20 * E[number of defective components per lot] = $20 * 120 = $2400
With the guarantee, the expected cost of repairing defective components is the sum of the cost of the guarantee and the expected cost of repairing any additional defective components beyond the first 100. The probability of having more than 100 defective components per lot is:
P[number of defective components per lot > 100] = P[number of defective components per lot = 120] + P[number of defective components per lot = 150] + P[number of defective components per lot = 170] + P[number of defective components per lot = 180] + P[number of defective components per lot = 205] = 0.1 + 0.05 + 0.03 + 0.02 + 0.005 = 0.205
Therefore, the expected cost of repairing defective components with the guarantee is:
E[repair cost with guarantee] = $1000 + $20 * (E[number of defective components per lot] - 100) * P[number of defective components per lot > 100]
= $1000 + $20 * (120 - 100) * 0.205
= $1000 + $410 = $1410
Since the expected cost of repairing defective components with the guarantee ($1410) is lower than the expected cost of repairing defective components without the guarantee ($2400), it is worthwhile for the purchasing agent to purchase the supplier's guarantee policy.
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Use the Festival data set below to calculate a 2-year Weighted Moving Average (WMA) to predict the number of guests at the festival in 2022. Use the weights of 0.7 and 0.3 for the 2-year WMA, where the first weight is used for the most recent year and the last weight is used for the least recent year. Round your answer to two decimal places, if necessary.Year Number of guests2015 13982016 17732017 15352018 17712019 15592020 16572021 2968Please explain steps clearly, will rate positively if correct, thank you
Answers
The predicted number of guests at the festival in 2022 is 1846.15, rounded to two decimal places.
To calculate the 2-year Weighted Moving Average (WMA) to predict the number of guests at the festival in 2022, you will need to follow these steps:
1. First, you need to calculate the weighted average for the most recent two years. To do this, you multiply the number of guests in 2021 (2968) by the first weight (0.7), and you multiply the number of guests in 2020 (1657) by the second weight (0.3). Then you add the two products together to get the weighted average for 2020-2021:
Weighted Average = (2968 x 0.7) + (1657 x 0.3) = 2077.9
2. Next, you need to calculate the weighted average for the previous two years. To do this, you multiply the number of guests in 2019 (1559) by the first weight (0.7), and you multiply the number of guests in 2018 (1771) by the second weight (0.3). Then you add the two products together to get the weighted average for 2018-2019:
Weighted Average = (1559 x 0.7) + (1771 x 0.3) = 1614.4
3. Finally, you take the average of the two weighted averages calculated in steps 1 and 2 to get the 2-year Weighted Moving Average for 2022:
2-year WMA for 2022 = (2077.9 + 1614.4) / 2 = 1846.15
Therefore, the predicted number of guests at the festival in 2022 is 1846.15, rounded to two decimal places.
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2. which conditions must hold for inferential procedures to be valid for this scenario? select all that apply. a. the expected count for each level of the categorical variable must be at least 5. b. the two sample groups must be independent of each other. c. the data distribution for both men's and women's hemoglobin levels must be normally distributed or each sample size must be larger than 30. d. the observations within each sample must be independent. e. there must be 10 successes and 10 failures in each sample.
Answers
The conditions that must hold for inferential procedures to be valid for this scenario are:
(b) the two sample groups must be independent of each other, (c) the data distribution for both men's and women's hemoglobin levels must be normally distributed or each sample size must be larger than 30, and (d) the observations within each sample must be independent.
(b) The two sample groups must be independent of each other because the samples should not be related in any way that could influence the results.
(c) The data distribution for both men's and women's hemoglobin levels must be normally distributed or each sample size must be larger than 30. If the data is not normally distributed, then the Central Limit Theorem can be applied if the sample size is greater than 30.
(d) The observations within each sample must be independent to avoid bias in the results. This means that each observation should not be influenced by any other observation.
(a) The expected count for each level of the categorical variable must be at least 5. This condition is relevant for Chi-square tests of independence, which are not being used in this scenario.
(e) There must be 10 successes and 10 failures in each sample. This condition is relevant for tests of proportions, which are not being used in this scenario.
So b,c and d are correct options.
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3.4 Let X have a chi-square distribution with n degrees of freedom. Use the moment generating function technique to find the limiting distribution of the random variable ? X-n V2n [10] Explain how the result of the above question can be used for practical purposes. [2]
Answers
Using the moment generating function technique, we can determine the limiting distribution of X as n approaches infinity, but the exact form of the distribution will depend on the value of t and may require additional approximation methods to evaluate.
To find the limiting distribution of the random variable X with a chi-square distribution, we can use the moment generating function (MGF) technique. The moment generating function of X is defined as M_X(t) = E(e^(tX)).
For a chi-square distribution with n degrees of freedom, the probability density function (pdf) is given by:
f(x) = (1/(2^(n/2) * Γ(n/2))) * x^((n/2)-1) * e^(-x/2)
To find the moment generating function, we evaluate the integral:
M_X(t) = ∫[0 to ∞] e^(tx) * f(x) dx
Substituting the pdf into the MGF expression, we have:
M_X(t) = ∫[0 to ∞] e^(tx) * (1/(2^(n/2) * Γ(n/2))) * x^((n/2)-1) * e^(-x/2) dx
Simplifying, we get:
M_X(t) = (1/(2^(n/2) * Γ(n/2))) * ∫[0 to ∞] x^((n/2)-1) * e^((t-1/2)x) dx
To find the limiting distribution, we take the limit of the MGF as n approaches infinity. Using the property of the gamma function, we have:
lim(n->∞) (1/(2^(n/2) * Γ(n/2))) = 1
So, the limiting moment generating function becomes:
lim(n->∞) M_X(t) = ∫[0 to ∞] x^((n/2)-1) * e^((t-1/2)x) dx
To evaluate this integral, we need to use techniques such as Laplace's method or the saddlepoint approximation. The exact form of the limiting distribution depends on the specific value of t and may not have a closed-form expression.
Therefore, using the moment generating function technique, we can determine the limiting distribution of X as n approaches infinity, but the exact form of the distribution will depend on the value of t and may require additional approximation methods to evaluate.
The result obtained for the limiting distribution of the random variable X with a chi-square distribution as n approaches infinity has practical implications in various areas. Here are a few examples:
Approximation of chi-square distributions: The limiting distribution can be used as an approximation for chi-square distributions with large degrees of freedom. When the degrees of freedom are sufficiently large, the limiting distribution can provide a good approximation to the chi-square distribution. This can be useful in statistical analysis and hypothesis testing, where chi-square distributions are commonly used.
Central Limit Theorem: The result is related to the Central Limit Theorem, which states that the sum or average of a large number of independent and identically distributed random variables tends to follow a normal distribution. Since the chi-square distribution arises in various statistical contexts, the limiting distribution can help in approximating the distribution of sums or averages involving chi-square random variables.
Statistical inference: The limiting distribution can have implications for statistical inference procedures. For example, in hypothesis testing or confidence interval estimation involving chi-square statistics, knowledge of the limiting distribution can aid in determining critical values or constructing confidence intervals. It can also be used to assess the asymptotic properties of estimators based on chi-square distributions.
Simulation studies: The limiting distribution can be used in simulation studies to generate random samples that mimic chi-square distributions with large degrees of freedom. This can be helpful in situations where directly simulating from the chi-square distribution is computationally expensive or difficult.
Overall, understanding the limiting distribution of the chi-square distribution as n approaches infinity provides insights into the behavior of chi-square random variables and can be used as a practical tool in various statistical applications, such as approximation, inference, and simulation studies.
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A home has a rectangular kitchen. If listed as ordered pairs, the corners of the kitchen are (8, 4), (−3, 4), (8, −8), and (−3, −8). What is the area of the kitchen in square feet?
20 ft2
46 ft2
132 ft2
144 ft2
Answers
If the corners of the kitchen are (8, 4), (−3, 4), (8, −8), and (−3, −8), the area of the kitchen is 132 square feet. So, the correct option is C.
To find the area of the rectangular kitchen, we need to use the formula for the area of a rectangle, which is A = L x W, where A is the area, L is the length, and W is the width.
From the given ordered pairs, we can determine the length and width of the rectangle. The length is the distance between the points (8,4) and (-3,4), which is 8 - (-3) = 11 feet. The width is the distance between the points (8,4) and (8,-8), which is 4 - (-8) = 12 feet.
Now that we know the length and width, we can find the area by multiplying them together:
A = L x W = 11 x 12 = 132 square feet
Therefore, the correct answer is C.
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Answer C. 132 fT2
Step-by-step explanation:
The scale on this drawing is 2 in: 5 ft. Based on this, how
many inches long and wide will the kitchen be?
Answers
The actual length and width of the kitchen in the scale drawing is: 22.5 ft x 17.5 ft
How to Interpret Scale Drawing?A scale drawing is defined as an enlargement of an object. An enlargement changes the size of an object by multiplying each of the lengths by a scale factor to make it larger or smaller. The scale of a drawing is usually stated as a ratio.
Now, the scale factor of the given drawing is seen as 2 in : 5 ft
From the drawing the dimensions of the kitchen are:
9" x 7"
Thus:
True length = (9 * 5)/2 = 22.5 ft
True width = (7 * 5)/2 = 17.5 ft
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Kinetic energy of 1200 kg and 8.33 m/s
Answers
Answer:
The kinetic energy (KE) of an object with mass (m) moving at a velocity (v) can be calculated using the formula:
KE = 1/2 * m * v^2
Substituting the given values:
KE = 1/2 * 1200 kg * (8.33 m/s)^2
KE = 41,147.5 J
Therefore, the kinetic energy of the object is 41,147.5 Joules.
Step-by-step explanation:
Determine the roots of each of the following quadratic equations using the factorisation method (b) x^2-10+16=0
(e) 2x^2+3x-9=0
(h) x^-5x=0
Answers
Roots of a quadratic equation using the factorisation method, we need to find two numbers that multiply to the constant term of the equation and add up to the coefficient of the linear term. Then, we can use these two numbers to factor the quadratic expression and solve for the roots.
a) For the quadratic equation x^2 - 10x + 16 = 0, we need to find two numbers that multiply to 16 and add up to -10. These numbers are -2 and -8, so we can write the quadratic as (x - 2)(x - 8) = 0. Setting each factor equal to zero, we get x - 2 = 0 and x - 8 = 0, which give us the roots x = 2 and x = 8.
b) For the quadratic equation 2x^2 + 3x - 9 = 0, we need to find two numbers that multiply to -18 (since 2*(-9) = -18) and add up to 3. These numbers are 6 and -3, so we can write the quadratic as 2x^2 + 6x - 9x - 9 = 0. Factoring by grouping, we get 2x(x + 3) - 9(x + 3) = 0, which simplifies to (2x - 9)(x + 3) = 0. Setting each factor equal to zero, we get 2x - 9 = 0 and x + 3 = 0, which give us the roots x = 9/2 and x = -3.
c) For the quadratic equation x^2 - 5x = 0, we can factor out an x to get x(x - 5) = 0. Setting each factor equal to zero, we get x = 0 and x - 5 = 0, which give us the roots x = 0 and x = 5.
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find vertices of:
(x-2)^2/16-(y-1)^2/4=1
show work pls!!
Answers
We can see here that the vertices will be:
(6, 1)(-2, 1)What is vertex?The vertex, in geometry, is the intersection of two or more lines, curves, or edges. It can also refer to the vertex of a parabola, which is where a function reaches its highest or lowest value.
We can see here that the equation of the hyperbola is seen in standard form. It is known that the center of the hyperbola is at (h, k) is (2, 1).
The distance between the center and vertices = a
where a² = coefficient of the positive term
So we see that a² = 16
a = 4.
Also, the distance between the center and co-vertices = b
where b² = 4
b = 2.
Thus,
Vertex 1 = (2 + 4, 1) = (6, 1)
Vertex 2 = (2 - 4, 1) = (-2, 1).
Therefore, the vertices are:
(6, 1) and (-2, 1).
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4. The proportion of the defective paper cups from Supplier A is 0.08. A random sample of 200 cups from each supplier is taken. What is the probability that the sample proportion of defective from Supplier A is a) less 10%.
b) at least 5%?
c) from 5% to 10%?
d) exactly 8%?
Answers
a) To calculate the probability that the sample proportion of defective cups from Supplier A is less than 10%, we need to find the probability that the sample proportion is less than 0.10. Thus, we need to find P(p < 0.10).
We can use the central limit theorem to approximate the distribution of the sample proportion as a normal distribution, with mean μ = 0.08 and standard deviation [tex]σ = \sqrt{0.08 (\frac{1-0.08)}{200} )}= 0.024[/tex]. Then, we can standardize the distribution and use a standard normal table or calculator to find the probability:
[tex]P (p < 0.10)=P(\frac{p-u}{σ} < \frac{0.10-0.08}{0.024} = P(z < 0.83)=0.7977[/tex]
Therefore, the probability that the sample proportion of defective cups from Supplier A is less than 10% is approximately 0.7977.
b) To calculate the probability that the sample proportion of defective cups from Supplier A is at least 5%, we need to find the probability that the sample proportion is greater than or equal to 0.05. Thus, we need to find P(p≥ 0.05).
Using the same approach as in part (a), we can find that P(p < 0.05)=-0.0207. Therefore, P(p ≥ 0.05) = 1 - P(p< 0.05) =0.9793.
Therefore, the probability that the sample proportion of defective cups from Supplier A is at least 5% is approximately 0.9793.
c) To calculate the probability that the sample proportion of defective cups from Supplier A is between 5% and 10%, we need to find the probability that 0.05 ≤ p < 0.10. We can use the same approach as in part (a) to find that P(p < 0.05) = 0.0207 and P(p < 0.10) = 0.7977. Therefore, P(0.05 ≤ p < 0.10) = P(p < 0.10) - P(p < 0.05) = 0.7770.
Therefore, the probability that the sample proportion of defective cups from Supplier A is between 5% and 10% is approximately 0.7770.
d) To calculate the probability that the sample proportion of defective cups from Supplier A is exactly 8%, we need to find P(p = 0.08). Since the sample proportion is a discrete random variable, we can use the binomial distribution to find the probability:
[tex]P(p=0.08)=(200 choose 16) (0.080)^{16} (1-0.08)^{184} = 0.1567[/tex]
Therefore, the probability that the sample proportion of defective cups from Supplier A is exactly 8% is approximately 0.1567.
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1.1 Find the domain of the following functions of: g(x) = root of {(x - 1)(2 – 2)}. 1.2 The size of an insect population at time t (measured in days) is given by p(t) = 3000 - 2000/(1+t^2). Determine the initial Determine the initial population P(0) and the population size after 4 days
Answers
1.1 To find the domain of the function g(x) = √((x - 1)(2 – 2)), first, we need to determine the values of x for which the function is defined.
Since the expression inside the square root is (x - 1)(2 – 2), we can see that (2 – 2) equals zero. Therefore, the expression inside the square root simplifies to (x - 1) * 0, which is always equal to 0. The square root of 0 is also 0, so the function g(x) is defined for all real values of x. Hence, the domain of the function g(x) is all real numbers.
1.2 The size of an insect population at time t (measured in days) is given by the function p(t) = 3000 - 2000/(1+t^2). To determine the initial population (P(0)), substitute t = 0 into the function:
P(0) = 3000 - 2000/(1 + 0^2) = 3000 - 2000/1 = 3000 - 2000 = 1000
So the initial population is 1000 insects.
Next, we need to find the population size after 4 days, which means we need to evaluate p(4):
P(4) = 3000 - 2000/(1 + 4^2) = 3000 - 2000/(1 + 16) = 3000 - 2000/17 ≈ 2882.35
After 4 days, the population size is approximately 2882.35 insects.
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