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Suppose that the lifetimes of a certain kind of light bulb are normally distributed with a standard deviation of100 hours. If exactly99% of the bulbs

Suppose that the lifetimes of a certain kind of light bulb are normally distributed with a standard deviation of100 hours. If exactly99% of the bulbs die before920 hours, find the mean lifetime of the bulbs. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.

______ hours

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