The following frequency distribution reports electricity, Ask an Expert

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The following frequency distribution reports electricity cost for sample of 50 two-bedroom apartments in Albuquerque, New Mexico throughout 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) Determine the mean cost.

b) Determine the standard deviation.

c) Use the Empirical Rule to estimate the proportion of costs in two standard deviations of mean. What are these limits?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M918169

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