November 25, 2015

Homework Help: statistic

Posted by mark on Monday, October 24, 2011 at 1:16pm.

A survey was made of 100 customers in a department store. 70 of the customers indicated they visited the store because of a newspaper advertisement. The remainder had not seen the ad. A total of 40 customers made purchases; of these customers, 30 had seen the ad. What is the probability that a customer who saw the ad. made a purchase?

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