jamalbaugh jamalbaugh

12-09-2018
Mathematics

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what portion of light bulbs will last more than 62 hours

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viktoria1198zz viktoria1198zz

12-09-2018

Crystal Clear 60-watt light bulb that it advertises will last 1500 hours. Suppose that lifetimes of the light bulbs are approximately normally distributed with a mean of 1550 hours and a standard deviation of 57 hours.

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