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6.2 Exercise 14

Avg difficulty 2.5

In the United States the ages 13 to 55+ of smartphone users approximately follow a normal distribution with approximate mean and standard deviation of 36.9 years and 13.9 years, respectively. Using this information, answer the following questions. —Round answers to one decimal place.

a. Calculate the interquartile range (IQR).

OpenStax Statistics, 6.2 Using the Normal Distribution, exercise 14

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