Haggins Plumbing and Heating maintains a stock of 30-gallon hot water heaters that it sells to home-owners and installs for them. The owner likes the idea of having large supply on hand so as to meet all customer demand, but he also recognizes that it is expensive to do so. He examines hot water heater sales over the past 50 weeks and notes the following:

Using the random numbers given gelow, simulate demand for 20 weeks and answer the following questions:
(i) If Higgins maintains a constant supply of 8 hot water heaters in any given week, how many times will he be out of stock during the 20-week simulation period?
(ii) What is the average number of heaters demanded per week over the 20-week interval?

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Hot water heater sales per week 4 Number of weeks this number was sold 567 6 5 9 12 8 8 9 7 10 3 Total 50