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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 1200hr and a standard

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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 1200hr and a standard deviation of 150hr. If 80,000 of these bulbs are produced, what percentage of light bulbs will last between 960hr and 1410hr ? The percentage of light bulbs that will last between 960hr and 1410hr is (Round to two decimal places as needed.)

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