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April 27, 2015

Homework Help: adult education

Posted by sally on Saturday, May 23, 2009 at 4:57pm.

The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 290 hours
and a standard deviation of 6 hours. What percentage of the bulbs have lifetimes that lie within 1
standard deviation to either side of the mean?

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