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The following frequency distribution reports electricity cost for sample of 50 two-bebroom apartments in albuquerque, new mexico throughout the month of May last year.

Electricity cost

Frequency

$80 upto $100

3

100 to 120

8

120 to 140

12

140 to 160

16

160 to 180

7

180 to 200

4

Total

50

  1. Estimate the mean cost.
  2. Estimate the standard deviation.
  3. Employ the empirical Rule to estimate the proportion of costs in two standards deviations of mean. What are these limits.

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M917315

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