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20 January, 08:41

What portion of light bulbs will last more than 62 hours

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  1. 20 January, 09:00
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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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