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Frequency Distribution: Electricity costs

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Using excel

The following frequency distribution reports the electricity cost for a sample of 50 two bedroom apartments in Albuquerque, New Mexico during the month of May last year.

Electricity Cost Frequency
$ 80 up to $100 3
100 up to 120 8
120 up to 140 12
140 up to 160 16
160 up to 180 7
180 up to 200 4
Total 50

a. Estimate the mean cost.
b. Estimate the standard deviation.
c. Use the Empirical Rule to estimate the proportion of costs within two standard deviations of the mean. What are these limits?

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Solution Summary

The solution provides step by step method for the preparation of frequency distribution and calculation of descriptive statistics from frequency distribution. The solution also provides empirical rule of mean and standard deviation. Formula for the calculation and Interpretations of the results are also included.

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