# Question

The following table gives the frequency distribution of the number of hours spent per week on activities that involve sports and/or exercise by a sample of 400 Americans. The numbers are consistent with the summary results from the Bureau of Labor Statistics’ American Time Use Survey (www.bls.gov/tus).

Hours per Week Number of People

0 to less than 3.5............ 34

3.5 to less than 7.0............ 92

7.0 to less than 10.5.......... 55

10.5 to less than 14........... 0 83

14.0 to less than 28.0........... 121

28.0 to less than 56.0........... 15

Find the mean, variance, and standard deviation.

Hours per Week Number of People

0 to less than 3.5............ 34

3.5 to less than 7.0............ 92

7.0 to less than 10.5.......... 55

10.5 to less than 14........... 0 83

14.0 to less than 28.0........... 121

28.0 to less than 56.0........... 15

Find the mean, variance, and standard deviation.

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