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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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the average middle-distance runner at a local high school run the mile in 4.5 minutes, with a standard deviation of 0.3 minute. find the percentage of a runners that will run the mile in less than 4 minutes?
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