Exam1_practice

Exam1_practice - 5E practice problems for exam 1 1. A total...

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5E practice problems for exam 1 1. A total of 500 married working couples were polled about their annual salaries, with the following information resulting. Husband Wife Less than $75,000 More than $75,000 Less than $75,000 212 198 More than $75,000 36 54 Thus, for instance, in 36 of the couples the wife earned more and the husband earned less than $75,000. One of the couples questioned is to be chosen at randomly. (a) What is the probability that the husband earns less than $75,000? (b) Find the probability that the wife earns more than $75,000 given that the husband earns more than this amount? 2. Bill has two old cars, a Pontiac and a Honda. At this point, neither is very reliable. Let .75 be the probability that he arrives to work without car problems when he drives the Pontiac, and let .60 be the probability that he arrives to work without car problems if he takes the Honda. Because Pontiac is more reliable, Bill chooses to drive Pontiac to work with probability .80. What is the probability that tomorrow Bill
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This note was uploaded on 06/18/2009 for the course STAT Pstat 5E taught by Professor Landrigan during the Fall '08 term at UCSB.

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Exam1_practice - 5E practice problems for exam 1 1. A total...

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