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# Comparing means and dispersion

The annual incomes of the five vice presidents of TMV Industries are: \$125,000; \$128,000; \$122,000; \$133,000; and \$140,000. Consider this a population.
a. What is the range?
b. What is the arithmetic mean income?
c. What is the population variance? The standard deviation?
d. The annual incomes of officers of another firm similar to TMV Industries were also studied.
The mean was \$129,000 and the standard deviation \$8,612. Compare the means
and dispersion in the two firms.

determine the mean and the standard deviation of the following frequency distribution:

Class Frequency
0 up to 5 2
5 up to 10 7
10 up to 15 12
15 up to 20 6
20 up to 25 3

Listed below are the commissions earned (\$000)last year by the sales representatives at the furniture patch

\$3.9 \$5.7 \$7.3 \$10.6 \$13.0 \$13.6 \$15.1 \$15.8 \$17.1
17.4 17.6 22.3 38.6 43.2 87.7

A telephone number consist of seven digits,the first three representing the exchange. How many different telephone numbers are possible with the 537 exchange?

#### Solution Summary

Word and Excel files attached compare means and dispersion for annual incomes, as well as finding standard deviation, variance, range, etc.

\$2.19