The National Sporting Goods Association (NSGA) conducted a survey of the ages of people that purchased athletic footwear in 2009. The ages are summarized in the following relative frequency distribution. R-96

Suppose the survey was based on 100 individuals. Calculate the average age of this distribution. Calculate the sample standard deviation. Use 10 as the midpoint of the first class and 75 as the midpoint of the last class.

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Age of Purchaser Under 14 years old 14 to 17 years old 18 to 24 years old 25 to 34 years old Percent 19 6 10 13 35 to 44 years old 45 to 64 years old 65 years old and over 12 14 25 13