Practice and Problem-Solving Exercises

A Practice

See Problem 1.

Find the mean, variance, and standard deviation for each data set.

6. 78 90 456 673 111 381 21
7. 13 15 17 18 12 21 10
8. 12 3 2 4 5 7
9. 60 40 35 45 39

See Problem 2.

Graphing Calculator Find the mean and the standard deviation.

10. The Dow Jones Industrial average for the first 12 weeks of 1988:

    1911.31	1956.07	1903.51	1958.22	1910.48	1983.26
    2014.59	2023.21	2057.86	2034.98	2087.37	2067.14

11. The Dow Jones Industrial average for the first 12 weeks of 2008:

    12800.18	12606.30	12099.3	12207.17	12743.19	12182.13
    12348.21	12381.02	12266.39	11893.69	11951.09	11972.25

See Problem 3.

Determine the whole number of standard deviations from the mean that include all data values.

12. The mean price of the nonfiction books on a best-sellers list is $25.07; the standard deviation is $2.62.

    $26.95, $22.95, $24.00, $24.95, $29.95, $19.95, $24.95, $24.00, $27.95, $25.00

13. The mean length of Beethoven's nine symphonies is 37 minutes; the standard deviation is 12 minutes.

    27 min, 30 min, 47 min, 35 min, 30 min, 40 min, 35 min, 22 min, 65 min

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