# Badarinarayanan_Charanya_Second Exam W2 - Problem 1 2 3 4 5...

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Problem Value Earned 1 12 2 12 3 12 4 12 5 13 6 13 7 13 8 13 Total 100 0 Problem 1) A restaurant chain routinely surveys customers and among other questions asks each c whether he or she would return, and also to rate the quality of food. The following table summarizes thousands of questionnaires by showing the percentage in each category. Will Won't Rating Return Return Poor 2 10 12 Fair 8 9 17 Good 35 14 49 Excellent 20 2 22 65 35 100 a) P(Food is good and will return) 0.35 b) Of the customers who say they will return, what proportion rated the food as good? P(Food is good and will return)/P(will return) 0.54 What proportion of customers indicate that they will return and rate the food as good?

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c) Of the customers who rated the food as good, what proportion said they would return? P(Food is good and will return)/P(Food is good) 0.71
customer e

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Problem 2) Most internet service providers (ISPs) attempt to provide a large enough service so that customers can usually obtain a connection. Suppose that the customers of one ISP establish a connection 90% of the time on their first try. P(connecti P(connecti a) What is the probability that the customer will make a connection in one or two tries? P(not connecting on first try or second try)=.1 + (.1*.1) 0.11 P(Connecting in the first or second try) 0.89 b) If a customer, on average, makes 12 connections per week, what is the probability that he/she made the connection on the first try for all twelve times? mean = 1 p(x=1) 0.37 c) Again assuming 12 connctions per week, what is the probability that he/she made the connection at least 10 times on the first try?

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## This note was uploaded on 10/02/2011 for the course MIS 6312 taught by Professor Wiorkowski during the Spring '11 term at University of Texas at Dallas, Richardson.

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Badarinarayanan_Charanya_Second Exam W2 - Problem 1 2 3 4 5...

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