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 81 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.)

In this question, we are not provided with the data that is necessary in order to answer it. Therefore, we cannot know what the age distribution of prehistoric Native Americans was. However, we can give you an explanation of the concepts that will allow you to answer this question on your own.

First, you need to get the mean age expressed in years. The mean is the value you get after adding up the values of all terms and dividing them by the number of terms. The sample variance is the average of the squared differences from the mean. Finally, the standard deviation is the measure of how spread out the numbers are. It is also the square root of the variance.

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step-by-step explanation:

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both equations and proportions are better.