Exercises for Section 1.2
10. A sample of 100 adult women was taken, and
each was asked how many children she had.
The results were as follows:
Children
0
1
2
3
4
5
Number
of
Women
27
22
30
12
7
2
a.
Find the sample mean number of children.
b.
Find the sample standard deviation of the
number of children.
c.
Find the sample median of the number of
children.
d.
What is the first quartile of the number of
children?
e.
What proportion of the women had more
than the mean number of children?
f.
For what proportion of the women was the
number of children more than one standard
deviation greater than the mean?
g.
For what proportion of the womenwas the
number of children within one standard
deviation of the mean?
14. There are 10 employees in a particular division
of a company. Their salaries have a mean of
$70,000, a median of $55,000, and a standard
deviation of $60,000.
The largest number on
the list is $100,000.
By accident, this number is
changed to $1,000,000.
a.
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 Fall '10
 Zhai
 Standard Deviation, $55,000, $34,000, J. Pinto

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