Question

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 85 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	39	16	16	14

x	=
s2	=
s	=

Can someone please explain this problem in as much detail as possible? It would help me better understand. Thanks.

Answer 1

ANSWER

The Table given by

Age range	Class boundries	Mid points[xi]	No. of individuals[fi]	fixi	fixi^2
1-10	0.5 - 10.5	5.5	39	214.5	1,179.75
11-20	10.5-20.5	15.5	16	248	3844
21-30	20.5-30.5	25.5	16	408	10,404
31 and over	30.5 and over	35.5	14	497	17,643.5
Total			85	1,367.5	33,071.25

From table ,

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