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April 27, 2015

Homework Help: statistics

Posted by HELPME on Monday, December 19, 2011 at 9:34pm.

the life of electric bulbs has a normal distribution with a mean of 35 months and a standard deviation of 4 months. What should the warranty period be if the company that manufactures these bulbs does not want to replace more than 2% of the bulbs?

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