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The number of light bulbs that will last between 1570 he and 1850 Suppose that the life expectancy of a certain brand of nondetective light

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The number of light bulbs that will last between 1570 he and 1850 Suppose that the life expectancy of a certain brand of nondetective light bulbs is normally distributed with a mean life of 1700 hr and a standard deviation of 100 hr. If 30.000 of these bulbs are produced, how many will last between 1570 hr and 1850 hr? Round to the nearest whole number)

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