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If the variance of a light bulb is 400 and the mean lifetime of a light bulb is 600 hours. find the probablity of a light bulb lasting at most 622 hours
8 years ago

Answers

Reiny
so SD = ?400 = 20
mean = 600

use
http://davidmlane.com/normal.html
and plug in your values
8 years ago

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