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    Frequency Distribution and Electricity Cost

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    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 Costs 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
    What are these limits?

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    Solution Summary

    The solution determines the frequency distribution and electricity cost.