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Mean, Median, Range, Standard Deviation

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Creek Ratz is a very popular restaurant located along the coast of northern Florida. They serve a variety of steak and seafood dinners. During the summer beach season, they do not take reservations or accept â??call aheadâ? seating. Management of the restaurant is concerned with the time a patron must wait before being seated for dinner. Listed below is the wait time, in minutes, for the 25 tables seated last Saturday night.
28 39 23 67 37 28 56 40 28 50
51 45 44 65 61 27 24 61 34 44
64 25 24 27 29

1. Explain why the times are a population.
2. Find the mean and median of the times.
3. Find the range and the standard deviation of the times.

2.) 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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