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Elementary Statistics: A Step by Step Approach 8th ed. | 8th Edition | ISBN: 9780073386102 | Authors: Allan G Bluman Professor Emeritus
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Cell Phone Lifetimes A recent study of the lifetimes of

Chapter 6, Problem 16

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QUESTION:

Assume that the sample is taken from a large population and the correction factor can be ignored.


Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is 24.3 months. The standard deviation is 2.6 months. If a company provides its 33 employees with a cell phone, find the probability that the mean lifetime of these phones will be less than 23.8 months. Assume cell phone life is a normally distributed variable.

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QUESTION:

Assume that the sample is taken from a large population and the correction factor can be ignored.


Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is 24.3 months. The standard deviation is 2.6 months. If a company provides its 33 employees with a cell phone, find the probability that the mean lifetime of these phones will be less than 23.8 months. Assume cell phone life is a normally distributed variable.

ANSWER:

Step 1 of 3

Given,

The average lifetime of cellphone is,

Standard deviation is,

And

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