A First Course in Probability (10th Edition)

10th Edition

ISBN: 9780134753119

Author: Sheldon Ross

Publisher: PEARSON

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Textbook Question

Chapter 8, Problem 8.20P

If X is a nonne9ative random variable with mean 25, what can be said about

a. E [ X 3 ] ?

b. E [ X ] ?

c. E [ log X ] ?

d. E [ e − X ] ?

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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Chapter 8, Problem 8.19P

Chapter 8, Problem 8.21P

Chapter 8 Solutions

A First Course in Probability (10th Edition)

Ch. 8 - Suppose that X is a random variable with mean and...Ch. 8 - From past experience, a professor knows that the...Ch. 8 - Use the central limit theorem to solve part (c) of...Ch. 8 - Let X1,...,X20 be independent Poisson random...Ch. 8 - Fifty numbers are rounded off to the nearest...Ch. 8 - A die is continually rolled until the total sum of...Ch. 8 - A person has 100 light bulbs whose lifetimes are...Ch. 8 - In Problem 8.7, suppose that it takes a random...Ch. 8 - If X is a gamma random variable with parameters...Ch. 8 - Civil engineers believe that W, the amount of...

Ch. 8 - Many people believe that the daily change of price...Ch. 8 - We have 100 components that we will put in use in...Ch. 8 - Student scores on exams given by a certain...Ch. 8 - A certain component is critical to the operation...Ch. 8 - An insurance company has 10.000 automobile...Ch. 8 - A.J. has 20 jobs that she must do in sequence,...Ch. 8 - Redo Example 5b under the assumption that the...Ch. 8 - Repeat part (a) of Problem 8.2 when it is known...Ch. 8 - A lake contains 4 distinct types of fish. Suppose...Ch. 8 - If X is a nonne9ative random variable with mean...Ch. 8 - Let X be a nonnegative random variable. Prove that...Ch. 8 - Prob. 8.22P Ch. 8 - Let X be a Poisson random variable with mean 20....Ch. 8 - Prob. 8.24P Ch. 8 - Prob. 8.25P Ch. 8 - If f(x) is an Increasing and g(x) is a decreasing...Ch. 8 - If L(p) is the Lorenz curve associated with the...Ch. 8 - Suppose that L(p) is the Lorenz curve associated...Ch. 8 - If X has variance 2, then , the positive square...Ch. 8 - If X has mean and standard deviation , the ratio...Ch. 8 - Compute the measurement signal-to-noise ratio-that...Ch. 8 - Let Zn,n1, be a sequence of random variables and...Ch. 8 - Prob. 8.5TE Ch. 8 - Prob. 8.6TE Ch. 8 - Prob. 8.7TE Ch. 8 - Explain why a gamma random variable with...Ch. 8 - Prob. 8.9TE Ch. 8 - If X is a Poisson random variable with mean , show...Ch. 8 - Prob. 8.11TE Ch. 8 - Prob. 8.12TE Ch. 8 - Prob. 8.13TE Ch. 8 - Prob. 8.14TE Ch. 8 - If f and g are density functions that are positive...Ch. 8 - Prob. 8.16TE Ch. 8 - The number of automobiles sold weekly at a certain...Ch. 8 - Prob. 8.2STPE Ch. 8 - If E[X]=75E[Y]=75Var(X)=10var(Y)=12cov(X,Y)=3 give...Ch. 8 - Prob. 8.4STPE Ch. 8 - Prob. 8.5STPE Ch. 8 - Prob. 8.6STPE Ch. 8 - Prob. 8.7STPE Ch. 8 - Prob. 8.8STPE Ch. 8 - Prob. 8.9STPE Ch. 8 - A tobacco company claims that the amount of...Ch. 8 - Prob. 8.11STPE Ch. 8 - Prob. 8.12STPE Ch. 8 - The strong law of large numbers states that with...Ch. 8 - Each new book donated to a library must be...Ch. 8 - Prove Chebyshevs sum inequality, which says that...

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The conditional probability of E given that F occurs is P(EF)=___________. So in rolling a die the conditional probability of the event E, getting a six, given that the event F, getting an even number, has occurred is P(EF)=___________.
The conditional probability of E given that F occur is P(EF)= _____________. So in rolling a die the conditional probability of the event E. “getting a six,” given that the event F, “getting an even number.” has occurred is P(EF)= ____________.

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If X is a nonne9ative random variable with mean 25, what can be said about a. E [ X 3 ] ? b. E [ X ] ? c. E [ log X ] ? d. E [ e − X ] ?

Solution Summary: The author explains that mathrmX is a nonnegative random variable with the mean 25.

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Chapter 8 Solutions