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April 21, 2014

Homework Help: statitics

Posted by jamie on Monday, April 18, 2011 at 1:09am.

a light bulb manufacture gaurentees that the mean life of a certain type of bulb is at least 875 hours. A random sample of 40 light bulbs has a mean life of 863 hours with a standard deviation of 50. a=0.04

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