The University of Dallas bookstore stocks textbooks in preparation for sales each semester. It…

The University of Dallas bookstore stocks textbooks in preparation for sales each semester. It…

The University of Dallas bookstore stocks textbooks in preparation for sales each semester. It normally relies on departmen­tal forecasts and preregistration records to determine how many copies of a text are needed. Preregistration shows 90 operations man­agement students enrolled, but bookstore manager Curtis Ketterman has second thoughts, based on his intuition and some historical evi­dence. Curtis believes that the distribution of sales may range from 70 to 90 units, according to the following probability model:
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Demand

70

75

80

85

90