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Suppose that the life expectancy of a certain brand of nondefective light bulbs is normallydistributed, with a mean life of 1300 hr and a standard

Suppose that the life expectancy of a certain brand of nondefective light bulbs is normallydistributed, with a mean life of 1300 hr and a standard deviation of 100 hr.

If 90,000 of these bulbs areproduced, how many will last between 1170 hr and 1410 hr?

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