A company installs 5000 light bulbs, each with an averge life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. find the percentahe of bulbs that can expected to last the period of time. less than 690 hours

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The answer is 97.1%

Expert answered|jeifunk|Points 6651|

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Asked 9/19/2012 11:19:40 AM

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