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Suppose a brand of light bulbs is normally distributed, with a mean life of 1500 hr and a standard deviation of 100 hr.Find the probability

Suppose a brand of light bulbs is normally distributed, with a mean life of 1500 hr and a standard deviation of 100 hr.Find the probability that a light bulb of that brand lasts between 1390 hr and 1630 hr.The probability that a light bulb will last between 1390 hr and 1630 hr is

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