The National Sporting Goods Association (NSGA)

conducted a survey o f the ages o f individuals that purchased skateboarding footwear. The ages o f this survey are summarized in the follow ing relative frequency distribution.

Suppose the survey was based on a sample o f 200 individuals. Calculate the mean and standard deviation of the age o f individuals th a t purchased skateboarding shoes.
Use 10 as the m id point o f the first class.

Transcribed Image Text:

Age of User Under 14 years old Percent 35 14 to 17 years old 41 18 to 24 years old 15 25 to 34 years old 35 to 44 years old 45 to 64 years old 4 4 1