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Arithmetic Mean of Hours

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I am having trouble with the following problem:
The Humans Relations Director at Ford began a study of the overtime hours in the Inspection Department. A sample of 15 workers showed they worked the following number of overtime hours last month:

13 13 12 15 7 15 5 12
6 7 12 10 9 13 12
I need to compute the arithmetic mean and indicate whether it is a statistic or parameter.

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Solution Summary

This solution uses the appropriate equation to calculate the arithmetic mean and identifies if the value is a parameter or a statistic.

Solution Preview

Arithmetic mean is given as:
is a parameter of the data, i.e., it ...

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