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The National Sporting Goods Association (NSGA) conducted a survey of the ages of individuals that purchased...

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Basic Math

The National Sporting Goods Association (NSGA) conducted asurvey of the ages of individuals that purchased skateboardingfootwear. The ages of this survey are summarized in the followingpercent frequency distribution. Assume the survey was based on asample of 200 individuals.

Age of UserPercent Frequency
Under 14 years old37
14 to 17 years old27
18 to 24 years old16
25 to 34 years old8
35 to 44 years old5
45 to 64 years old7

Calculate the mean and the standard deviation of the age ofindividuals that purchased skateboarding shoes. Use 10 as themidpoint of the first class. (Do not round intermediatecalculations. Round your answers to 2 decimal places.)

Mean-

Variance-

Standard Deviation-

Answer & Explanation Solved by verified expert
3.8 Ratings (611 Votes)
From the given data the following Table is calculatedAge of userMid point xPercent frequencyFrequency fx fx x 2f x 2Under 14 years    See Answer
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