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July 8, 2015

Homework Help: statistics

Posted by MARIA on Monday, January 9, 2012 at 10:47pm.

A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 hours and 900 hours?

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