Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally​ distributed, with a mean life of 1400 hr and a standard deviation of 100 hr. If 90,000 of these bulbs are​ produced, how many will last between 1830hr and 1975 ​hr?   The number of light bulbs that will last between 1290 hr and 1540 hr is ??

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