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April 19, 2014

Homework Help: statisitics

Posted by anoneemose on Saturday, January 19, 2013 at 9:29pm.

A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. How many bulbs should have a life expectancy between 400 and 600 hours?

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