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

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. Assume the survey was based on a sample of 200 individuals.
  Age of User     Percent
  Under 14 years old 23          
  14 to 17 years old 40          
  18 to 24 years old 18          
  25 to 34 years old 7          
  35 to 44 years old 7          
  45 to 64 years old 5          

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. (Do not round intermediate calculations. Round your answers to 2 decimal places.)
  Mean   
  Variance   
  Standard deviation   
math   Statistics-And-Probability   
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Anstee 10 | 午601466b old | |ㅋ56|1587 36 21 29413 2183 3955 5321843 25 to 3at old 5 36 to 4u Yeal old 29S 1o lo o 2.0 0 3981 103 To And Mean M ean- ru 396u 19.82To find that voslance: 2 VaianceN NJ tb 3262 2 (1982) 260 (516.3)-(392, 834) = 123.4176. -find the stunda)d devalion 526(19.&2) 20о J (5/6.31)-(292-8324) = 122.4476 Mean 19, 8 2 VaJiance 125·4776 Standaad devialton) - ts.it

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