ENGI2210_Test_II_Fall_2010

ENGI2210_Test_II_Fall_2010 - ENGI2210: PROBABILITY AND...

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ENGI2210: PROBABILITY AND STATISTICS FOR ENGINEERS TEST II Name: __________________________________________ Date: ___________ 1. Restaurant chain routinely surveys customers and among other questions asks each customers whether he or she would return and to rate the quality of food. Summarizing hundreds of thousands of questionnaires produced this table of joint probabilities. Rating Customer Will Return Customer Will Not Return Poor .02 .10 Fair .08 .09 Good .35 .14 Excellent .20 .02 a. What proportion of customers says that they will return and rate restaurant’s food as good? b. What proportion of customers who say that they will return rate the restaurant’s food as good? c. What proportion of customers who rate the restaurant’s food as good say that they will return? d. Discuss the differences in your answers to Parts a, b, and c. 2. Using historical records, the personnel manager of a plant has determined the probability distribution of X, the number of employees absent per day. It is
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ENGI2210_Test_II_Fall_2010 - ENGI2210: PROBABILITY AND...

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