BUS 3200 – The following frequency distribution reports

| August 31, 2017

Question
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. (Round your answer to 2 decimal places.)

Mean cost

b.Estimate the standard deviation. (Do not round intermediate calculations. Round your answer to 2 decimal places.)

Standard deviation

c.Use the Empirical Rule to estimate the proportion of costs within two standard deviations of the mean. What are these limits? (Round your answers to 2 decimal places.)

Limits are from $ to $ .

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