USING + UNDERSTANDING MATH CUSTOM
6th Edition
ISBN: 9780137721023
Author: Bennett
Publisher: PEARSON C
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Chapter 6.C, Problem 48E
To determine
Collect the data and make a histogram for each test of SAT.
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Total marks 16
5.
Let (,,P) be a probability space and let X : → R be a random
variable whose probability density function is given by f(x) = }}|x|e¯|×| for
x Є R.
(i)
(ii)
Find the characteristic function of the random variable X.
[8 Marks]
Using the result of (i), calculate the first two moments of the
random variable X, i.e., E(X") for n = 1, 2.
(iii) What is the variance of X?
[6 Marks]
[2 Marks]
Refer to page 12 for a problem on solving a homogeneous differential equation.
Instructions:
• Simplify the equation into a homogeneous form.
Use appropriate substitutions to reduce complexity.
Solve systematically and verify the final result with clear back-substitutions.
Link:
[https://drive.google.com/file/d/1wKSrun-GlxirS31Z9qoHazb9tC440AZF/view?usp=sharing]
Refer to page 36 for solving a bang-bang control problem.
Instructions:
•
Formulate the problem, identifying the control constraints.
•
•
Apply Pontryagin's Maximum Principle to derive the switching conditions.
Clearly illustrate the switching points in the control trajectory. Verify the solution satisfies the
optimality criteria.
Link: [https://drive.google.com/file/d/1wKSrun-GlxirS31Z9qoHazb9tC440 AZF/view?usp=sharing]
Chapter 6 Solutions
USING + UNDERSTANDING MATH CUSTOM
Ch. 6.A - Prob. 1QQCh. 6.A - On a math exam, one student scores 79 while 25...Ch. 6.A - One hundred students take a chemistry exam. All...Ch. 6.A - Twenty students take a political science exam....Ch. 6.A - A survey asks students to state many sodas they...Ch. 6.A - Among professional actors, a small number of...Ch. 6.A - The distribution of wages at a company is...Ch. 6.A - Compared to a distribution with a broad central...Ch. 6.A - Prob. 9QQCh. 6.A - The mayor of a town is considering a run for...
Ch. 6.A - 1. Define and distinguish among mean, median, and...Ch. 6.A - Prob. 2ECh. 6.A - Briefly describe at least two possible sources of...Ch. 6.A - Prob. 4ECh. 6.A - Prob. 5ECh. 6.A - Prob. 6ECh. 6.A - In my data set of 10 exam scores, the mean turned...Ch. 6.A - In my data set of 10 exam scores, the median...Ch. 6.A - I made a distribution of 15 apartment rents in my...Ch. 6.A - Prob. 10ECh. 6.A - The distribution of grades was left-skewed, but...Ch. 6.A - There’s much more variation in the ages of the...Ch. 6.A - Prob. 13ECh. 6.A - Mean, Median, and Mode. Compute the mean, median,...Ch. 6.A - Mean, Median, and Mode. Compute the mean, median,...Ch. 6.A - Prob. 16ECh. 6.A - 13–18: Mean, Median, and Mode. Compute the mean,...Ch. 6.A - Mean, Median, and Mode. Compute the mean, median,...Ch. 6.A - Outlier Coke. Cans of Coca-Cola vary slightly in...Ch. 6.A - Prob. 20ECh. 6.A - Prob. 21ECh. 6.A - Appropriate Average. State, with an explanation,...Ch. 6.A - Prob. 23ECh. 6.A - Appropriate Average. State, with an explanation,...Ch. 6.A - Prob. 25ECh. 6.A - Appropriate Average. State, with an explanation,...Ch. 6.A - Prob. 27ECh. 6.A - Describing Distributions. Consider the following...Ch. 6.A - Describing Distributions. Consider the following...Ch. 6.A - Describing Distributions. Consider the following...Ch. 6.A - Describing Distributions. Consider the following...Ch. 6.A - Describing Distributions. Consider the following...Ch. 6.A - Prob. 33ECh. 6.A - Describing Distributions. Consider the following...Ch. 6.A - Prob. 35ECh. 6.A - Prob. 36ECh. 6.A - Smooth Distributions. Through each histogram, draw...Ch. 6.A - Smooth Distributions. Through each histogram, draw...Ch. 6.A - Smooth Distributions. Through each histogram, draw...Ch. 6.A - Prob. 40ECh. 6.A - Family Income. Suppose you study family income in...Ch. 6.A - Airline Delays. Suppose you are a scheduler for a...Ch. 6.A - Prob. 43ECh. 6.A - Prob. 44ECh. 6.A - Prob. 45ECh. 6.A - Prob. 46ECh. 6.A - Prob. 47ECh. 6.A - Prob. 48ECh. 6.A - Prob. 49ECh. 6.A - 50. Daily Averages. Cite three examples of...Ch. 6.A - 51. Distributions in the News. Find three recent...Ch. 6.A - Prob. 52ECh. 6.B - The lowest score on an exam was 62, the median...Ch. 6.B - Which of the following is not part of a...Ch. 6.B - The lower quartile for wages at a coffee shop is...Ch. 6.B - Is it possible for a distribution to have a mean...Ch. 6.B - Suppose you are given the mean and just one data...Ch. 6.B - The standard deviation is best described as a...Ch. 6.B - What type of data distribution has a negative...Ch. 6.B - In any distribution, it is always true that a. the...Ch. 6.B - Which data set would you expect to have the...Ch. 6.B - Professors Smith, Jones, and Garcia all got the...Ch. 6.B - Consider two grocery stores at which the mean time...Ch. 6.B - Describe how we define and calculate the range of...Ch. 6.B - Prob. 3ECh. 6.B - Prob. 4ECh. 6.B - Prob. 5ECh. 6.B - Prob. 6ECh. 6.B - Both exams had the same range, so they must have...Ch. 6.B - The highest exam score was in the upper quartile...Ch. 6.B - For the 30 students who took the test, the high...Ch. 6.B - I examined the data carefully, and the range was...Ch. 6.B - The standard deviation for the heights of a group...Ch. 6.B - The mean gas mileage of the compact cars we tested...Ch. 6.B - 13. Big Bank Verification. Find the mean and...Ch. 6.B - Prob. 14ECh. 6.B - Comparing Variations. Consider the following data...Ch. 6.B - Prob. 16ECh. 6.B - Comparing Variations. Consider the following data...Ch. 6.B - Comparing Variations. Consider the following data...Ch. 6.B - Understanding Variation. The following exercises...Ch. 6.B - Understanding Variation. The following exercises...Ch. 6.B - Prob. 21ECh. 6.B - Airline Arrival Times. Two airlines have data on...Ch. 6.B - 23. Portfolio Standard Deviation. The book...Ch. 6.B - Defect Rates. Two factories each produce 1000...Ch. 6.B - Batting Standard Deviation. For the past 100...Ch. 6.B - Prob. 26ECh. 6.B - Prob. 27ECh. 6.B - Prob. 28ECh. 6.B - 29. Quality Control. An auto transmission...Ch. 6.B - Web Data Sets. Go to any website that gives data...Ch. 6.B - Prob. 31ECh. 6.B - Prob. 32ECh. 6.B - Prob. 33ECh. 6.B - Prob. 34ECh. 6.C - Graphs of normal distributions a. always look...Ch. 6.C - In a normal distribution, the mean a. is equal to...Ch. 6.C - In a normal distribution, data values farther from...Ch. 6.C - Prob. 4QQCh. 6.C - In a normal distribution, about 2/3 Of the data...Ch. 6.C - Prob. 6QQCh. 6.C - Prob. 7QQCh. 6.C - Prob. 8QQCh. 6.C - An acquaintance tells you that his IQ is in the...Ch. 6.C - Prob. 10QQCh. 6.C - 1. What is a normal distribution? Briefly describe...Ch. 6.C - 2. What is the 68-95-99.7 rule for normal...Ch. 6.C - 3. What is a standard score? How do you find the...Ch. 6.C - Prob. 4ECh. 6.C - Prob. 5ECh. 6.C - The weights of babies born at Belmont Hospital are...Ch. 6.C - The weights of babies born at Belmont Hospital are...Ch. 6.C - On yesterday's mathematics exam, the standard...Ch. 6.C - My professor graded the final on a curve, and she...Ch. 6.C - Jack is the 50th percentile for height, so he is...Ch. 6.C - Prob. 11ECh. 6.C - Prob. 12ECh. 6.C - Prob. 13ECh. 6.C - Prob. 14ECh. 6.C - Prob. 15ECh. 6.C - Prob. 16ECh. 6.C - Prob. 17ECh. 6.C - Prob. 18ECh. 6.C - Prob. 19ECh. 6.C - The 68-95-99.7 Rule. The resting heart rates for a...Ch. 6.C - Psychology Exam. The scores on a psychology exam...Ch. 6.C - Psychology Exam. The scores on a psychology exam...Ch. 6.C - Psychology Exam. The scores on a psychology exam...Ch. 6.C - Prob. 24ECh. 6.C - Psychology Exam. The scores on a psychology exam...Ch. 6.C - Prob. 26ECh. 6.C - Prob. 27ECh. 6.C - Prob. 28ECh. 6.C - Standard Scores and Percentiles. Use Table 6.3 to...Ch. 6.C - Standard Scores and Percentiles. Use Table 6.3 to...Ch. 6.C - Prob. 31ECh. 6.C - Prob. 32ECh. 6.C - Pregnancy Length. Actual lengths of terms are...Ch. 6.C - Pregnancy Length. Actual lengths of terms are...Ch. 6.C - Prob. 35ECh. 6.C - Prob. 36ECh. 6.C - Prob. 37ECh. 6.C - Prob. 38ECh. 6.C - 39. Is It Likely? Suppose you read that the...Ch. 6.C - Prob. 40ECh. 6.C - GRE Scores. Scores on the verbal Graduate Record...Ch. 6.C - Prob. 42ECh. 6.C - Prob. 43ECh. 6.C - Prob. 44ECh. 6.C - GRE Scores. Scores on the verbal Graduate Record...Ch. 6.C - Prob. 46ECh. 6.C - Prob. 47ECh. 6.C - Prob. 48ECh. 6.C - Prob. 49ECh. 6.C - Normal Demonstration. Do a Web search on the...Ch. 6.C - Normal Distributions. Many data sets described in...Ch. 6.C - Heights of American Men. The heights of American...Ch. 6.D - Prob. 1QQCh. 6.D - Prob. 2QQCh. 6.D - Prob. 3QQCh. 6.D - Prob. 4QQCh. 6.D - Prob. 5QQCh. 6.D - Prob. 6QQCh. 6.D - Consider a survey with a margin of error of 4%. If...Ch. 6.D - Prob. 8QQCh. 6.D - Prob. 9QQCh. 6.D - Prob. 10QQCh. 6.D - Prob. 1ECh. 6.D - Prob. 2ECh. 6.D - Prob. 3ECh. 6.D - Prob. 4ECh. 6.D - Prob. 5ECh. 6.D - Prob. 6ECh. 6.D - Prob. 7ECh. 6.D - Prob. 8ECh. 6.D - Prob. 9ECh. 6.D - Prob. 10ECh. 6.D - Both agencies conducted their surveys carefully,...Ch. 6.D - If you want to reduce the margin of error in your...Ch. 6.D - Prob. 13ECh. 6.D - Prob. 14ECh. 6.D - Prob. 15ECh. 6.D - Prob. 16ECh. 6.D - Prob. 17ECh. 6.D - Prob. 18ECh. 6.D - Prob. 19ECh. 6.D - Prob. 20ECh. 6.D - Human Body Temperature. A study by University of...Ch. 6.D - Seat Belts and Children. In a study of children...Ch. 6.D - SAT Preparation. A study of 75 students who took...Ch. 6.D - Weight by Age. A National Health Survey determined...Ch. 6.D - Margin of Error. Find the margin of error and the...Ch. 6.D - Prob. 26ECh. 6.D - Prob. 27ECh. 6.D - Prob. 28ECh. 6.D - Prob. 29ECh. 6.D - 25-32: Margin of Error. Find the margin of error...Ch. 6.D - Prob. 31ECh. 6.D - Prob. 32ECh. 6.D - Prob. 33ECh. 6.D - Prob. 34ECh. 6.D - Prob. 35ECh. 6.D - Prob. 36ECh. 6.D - Prob. 37ECh. 6.D - Prob. 38ECh. 6.D -
39-44: Hypothesis Tests. The following exercises...Ch. 6.D -
39-44: Hypothesis Tests. The following exercises...Ch. 6.D -
39-44: Hypothesis Tests. The following exercises...Ch. 6.D -
39-44: Hypothesis Tests. The following exercises...Ch. 6.D -
39-44: Hypothesis Tests. The following exercises...Ch. 6.D - Prob. 44ECh. 6.D - Prob. 45ECh. 6.D - Prob. 46ECh. 6.D - Prob. 47ECh. 6.D - Better Margin of Error. Suppose you want to...Ch. 6.D - Prob. 49ECh. 6.D - Recent Polls. Visit the websites of polling...Ch. 6.D - Prob. 52ECh. 6.D - Statistical Significance. Find a recent news...Ch. 6.D - Prob. 55ECh. 6.D - Hypothesis Testing. Find a news report describing...
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- Total marks 16 5. Let (N,F,P) be a probability space and let X : N → R be a random variable such that the probability density function is given by f(x)=ex for x € R. (i) Find the characteristic function of the random variable X. [8 Marks] (ii) Using the result of (i), calculate the first two moments of the random variable X, i.e., E(X") for n = 1,2. (iii) What is the variance of X. [6 Marks] [2 Marks]arrow_forward6. Let P be the standard normal distribution, i.e., P is the proba- bility measure on (R, B(R)) given by 1 dP(x) = 를 = e dx. √2πT Consider the random variables 21 fn(x) = (1 + x²) en+2, x Є R, n Є N. Using the dominated convergence theorem, prove that the limit Total marks 9 exists and find it. lim E(fn) n∞ [9 Marks]arrow_forwardRefer to page 38 for solving an optimal control problem using dynamic programming. Instructions: • Define the value function and derive the Hamilton-Jacobi-Bellman (HJB) equation. • Solve the HJB equation explicitly, showing all intermediate steps and justifications. Verify the solution satisfies the boundary conditions and optimality. Link: [https://drive.google.com/file/d/1wKSrun-GlxirS31Z9qoHazb9tC440AZF/view?usp=sharing]arrow_forward
- Refer to page 18 for solving a second-order linear non-homogeneous differential equation. Instructions: Solve the associated homogeneous equation first. Use either the method of undetermined coefficients or variation of parameters for the particular solution. • Provide detailed steps for combining solutions into the general solution. Link: [https://drive.google.com/file/d/1wKSrun-GlxirS31Z9qoHazb9tC440 AZF/view?usp=sharing]arrow_forward6. Let X be a random variable taking values in (0,∞) with proba- bility density function fx(u) = 5e5u u > 0. Total marks 8 Let Y = X2. Find the probability density function of Y. [8 Marks]arrow_forward5. Let a probability measure P on ([0,3], B([0,3])) be given by 1 dP(s): = ½ s² ds. 9 Consider a random variable X : [0,3] → R given by X(s) = s², sc [0,3]. S Total marks 7 Find the distribution of X. [7 Marks]arrow_forward
- Refer to page 24 for solving a differential equation using Laplace transforms. Instructions: Take the Laplace transform of the given equation, applying initial conditions appropriately. ⚫ Solve the resulting algebraic equation and find the inverse transform. Provide step-by-step solutions with intermediate results and final verification. Link: [https://drive.google.com/file/d/1wKSrun-GlxirS31Z9qoHazb9tC440 AZF/view?usp=sharing]arrow_forwardRefer to page 30 for deriving the Euler-Lagrange equation for an optimal control problem. Instructions: • Use the calculus of variations to derive the Euler-Lagrange equation. Clearly define the functional being minimized or maximized. Provide step-by-step derivations, including all necessary boundary conditions. Avoid skipping critical explanations. Link: [https://drive.google.com/file/d/1wKSrun-GlxirS3IZ9qoHazb9tC440 AZF/view?usp=sharing]arrow_forwardRefer to page 32 for solving a linear-quadratic regulator (LQR) problem. Instructions: • Formulate the cost functional and state-space representation. • Derive the Riccati equation and solve it step-by-step. Clearly explain how the optimal control law is obtained. Ensure all matrix algebra is shown in detail. Link: [https://drive.google.com/file/d/1wKSrun-GlxirS31Z9qoHazb9tC440AZF/view?usp=sharing]arrow_forward
- Refer to page 14 for solving a linear first-order differential equation. Instructions: • Convert the equation into its standard linear form. • Use integrating factors to find the solution. Show all steps explicitly, from finding the factor to integrating and simplifying the solution. Link [https://drive.google.com/file/d/1wKSrun-GlxirS31Z9qoHazb9tC440AZF/view?usp=sharing]arrow_forwardRefer to page 10 for a problem involving solving an exact differential equation. Instructions: • Verify if the equation is exact by testing әм მყ - ƏN მე If not exact, determine an integrating factor to make it exact. • Solve step-by-step, showing all derivations. Avoid irrelevant explanations. Link: [https://drive.google.com/file/d/1wKSrun-GlxirS31Z9qo Haz b9tC440AZF/view?usp=sharing]arrow_forwardRefer to page 10 for a problem involving solving an exact differential equation. Instructions: Verify exactness carefully. ⚫ If the equation is not exact, find an integrating factor to make it exact. Solve step-by-step and ensure no algebraic steps are skipped. Provide detailed explanations for each transformation. Link: [https://drive.google.com/file/d/1wKSrun-GlxirS31Z9qoHazb9tC440 AZF/view?usp=sharing]arrow_forward
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