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    Statistics - Mean & Standard Deviation

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    What was the age distribution of prehistoric Native Americans?
    Age Range: --------- 1-10 11-20 21-30 31-and over
    Number of individuals: 34 18 17 11

    Estimate the mean age expressed in years for this community, the sample standard deviation. For the class 31 and over, use 35.5 as the class midpoint.

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