What was the age distribution of prehistoric Native Americans? Extensive anthropological studies in the southwestern United States gave the following information about a prehistoric extended family group of 89 members on what is now a Native American reservation. For this community, estimate the mean age expressed in years, the sample variance, and the sample standard deviation. For the class 31 and over, use 35.5 as the class midpoint. (Round your answers to one decimal place.) Age range (years) 1-10 11-20 21-30 31 and over Number of individuals 38 21 16 14 x =   s2 =   s =

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What was the age distribution of prehistoric Native Americans? Extensive anthropological studies in the southwestern United States gave the following information about a prehistoric extended family group of 89 members on what is now a Native American reservation. For this community, estimate the mean age expressed in years, the sample variance, and the sample standard deviation. For the class 31 and over, use 35.5 as the class midpoint. (Round your answers to one decimal place.)

Age range (years) 1-10 11-20 21-30 31 and over
Number of individuals 38 21 16 14
x =  
s2 =  
s =  
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Step 1

Introduction:

For a grouped data with k classes having class marks xi, class frequency fi (i = 1, 2, …, k), total frequency n = Σ fi, the following are the formulae for the mean, variance, and standard deviation of a grouped data:

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