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26 May, 11:53

A certain brand of light bulb is advertised to last 1600 hours. suppose that the lifetimes of the light bulbs are normally distributed with a mean lifetime of 1650 hours and a standard deviation of 60 hours. sketch the normal distribution, go out 3 standard deviations.

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  1. 26 May, 13:03
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    3 times 60 = #

    # + 1650 gives you the answer. Good night!
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