Question

The National Sporting Goods Association (NSGA) conducted a survey of the ages of individuals that purchased skateboarding footwear. The ages of this survey are summarized in the following relative frequency distribution.
Age of User ........ Percent
Under 14 years old ..... 35
14 to 17 years old ..... 41
18 to 24 years old ..... 15
25 to 34 years old ..... 4
35 to 44 years old ..... 4
45 to 64 years old ..... 1

Suppose the survey was based on a sample of 200 individuals. Calculate the mean and the standard deviation of the age of individuals that purchased skateboarding shoes. Use 10 as the midpoint of the first class.



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  • CreatedJanuary 28, 2015
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