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Customer backgrounds.

A company that offers courses to prepare would-be M.B.A. students for the GMAT examination has the following information about its customers: 20% are currently undergraduate students in business; 15% are undergraduate students in other fields of study; 60% are college graduates who are currently employed; and 5% are college graduates who are not employed.

(a) This is a legitimate assignment of probabilities to customer backgrounds. Why?
(b) What percent of customers are currently undergraduates?

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Statistics and Probability, Statistics

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