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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. Suppose the survey was based on a sample of 200 individuals

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

Calculate the mean, variance and standard deviation of the age of individuals that purchased skateboarding shoes. Use 10 as the midpoint of the first class. Round answers to 2 decimal places.

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