a. To determine Find the mean and variance of x . Explanation Calculation: In the study of “Downloading apps to your cell phone”, nearly 40% of adult cell phone owners downloaded an application. The probability distribution of random variable x and the number of apps used at least once a week by cell phone owners who have downloaded an ‘app’ to their phone are given. Mean: μ = E ( x ) = ∑ x x p ( x ) Variance: σ 2 = E ( x − μ ) 2 = ∑ x ( x − μ ) 2 p ( x ) . The random variable x defines the number of apps used at least once a week by cell phone owners who have downloaded an ‘app’ to their phone. The mean of x is obtained as follows: μ = ∑ x x p ( x ) = 0 ( 0.17 ) + 1 ( 0 b. To determine Provide an interval that will contain the value of x with a probability of at least 0.75.

13th Edition

ISBN: 9780134080215

Author: James T. McClave, Terry T Sincich

Publisher: PEARSON

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Chapter 4.3, Problem 48ACB

To determine

Find the mean and variance of x.

To determine

Provide an interval that will contain the value of x with a probability of at least 0.75.

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Chapter 4.3, Problem 47ACB

Chapter 4.3, Problem 49ACB

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