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April 25, 2014

Homework Help: Statistics

Posted by Sophia on Thursday, October 4, 2007 at 6:23pm.

A manufacturer makes two models of an item: model I, which accounts for 80% of unit sales, and model II, which accounts for 20% of unit sales. Because of defects, the manufacturer has to replace (or exchange) 10% of its model I and 18% of its model II. If a model is selected at random, find the probability that it will be defective. The answer is .116, I just can't figure out how to work out the problem. Can anyone please help?

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