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# Determine the mean and standard deviation of the number of school-age children per family in Whitehall Estates.

The
distribution of the number of school-age children per family in the Whitehall
Estates area of Boise, Idaho, is:

 Number of children 0 1 2 3 4 Percent of families 25 30 40 3 2
 (a) Determine the mean and standard deviation of the number of school-age children per family in Whitehall Estates. (Round your answers to 2 decimal places.)
 Mean Standard deviation
 (b) A new school is planned in Whitehall Estates. An estimate of the number of school-age children is needed. There are 500 family units. How many children would you estimate?
 Children
 (c-1) Convert the preceding distribution to one for families with children. (Round your answers to 5 decimal places.)
 Number of Children (X) Probability given Children P(X) 1 2 3 4
 (c-2) What is the mean number of children among families that have children? (Round your answer to 2 decimal places.)

Mean

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