What was the age distribution of prehistoric Native Americans? Extensive anthrop

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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 84 members on what is now the Navajo Reservation in northwestern New Mexico.
Age range (years) 1-10* 11-20 21-30 31 and over
Number of individuals 36 15 23 10
*Includes infants.
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.)
x =
s2 =
s =

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