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Back to 7.3 Using the Central Limit Theorem

7.3 Exercise 28

Avg difficulty 2.5


Use the following information to answer the next five exercises: The length of time a particular smartphone's battery lasts follows an exponential distribution with a mean of ten months. A sample of 64 of these smartphones is taken.

Find the probability that the sample mean is between 7 and 11.

OpenStax Statistics, 7.3 Using the Central Limit Theorem, exercise 28

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Adapted from Statistics © 2022 Rice University. Licensed under CC BY 4.0. Source: Statistics. Imported at revision 7dea80a.