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

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

Some additional information is
needed about only the families having 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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