Question 87990
Problem #1
The number of unemployed workers in the United States in recent years (in millions) is given below, 
Year & # of unemployed
1992 / 9.61
1993 / 8.94
1994/ 8.00
1995 / 7.40
1996/ 7.24
1997/ 6.74
1998 / 6.21
1999/ 5.88
2000/ 5.66
2001/ 6.74 
a. Find the mean number unemployed (in millions) in this
period.
Anwer: Add the numbers and devide by 10 to get x-bar = 7.242
 Which year has unemployment closest to the
mean? 1996
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b. Find the standard deviation for the data.
1.2917
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c. In how many of these years is unemployment within
1 standard deviation of the mean? 
I'll let you figure this and the next.
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d. In how many of these years is unemployment within
3 standard deviations of the mean?
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Cheers,
Stan H.