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18 January, 19:33

What portion of light bulbs will last more than 62 hours

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  1. 18 January, 20:09
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    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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