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Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally distributed, with a mean life of 1700 hr and a

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Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally distributed, with a mean life of 1700 hr and a standard deviation of 50 hr. The number of light bulbs that will last between 1630 hr and 1760 hr is (Round to the nearest whole number.) If 50,000 of those bulbs are produced, how many will last between 1630 hr and 1760 hr? ents

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