The time, in hours, that a copying machine may work without breaking down is a normally distributed

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The time, in hours, that a copying machine may work without breaking down is a normally distributed random variable with mean 549 and standard deviation 68. Find the probability that the machine will work for at least 500 hours without breaking down.
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Complete Business Statistics

ISBN: 9780077239695

7th Edition

Authors: Amir Aczel, Jayavel Sounderpandian

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