sample variance and sample standard deviation

Statistics
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Age range (years) 1-10, 11-20, 21-30, 31+ (use 35.5 as midpoint) 

# of individuals in above groups: 36, 25, 20, 10. 

15.9 is the mean. what is the sample variance and sample standard deviation? round answers to one decimal place.

Jan 28th, 2015

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Jan 28th, 2015

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Jan 28th, 2015
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Jan 28th, 2015
Feb 21st, 2017
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