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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 1500hr 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 1500hr and a standard deviation of 100hr. If 80,000 of these bulbs are produced, what percentage can be expected to last less than 1620hr? The percentage of light bulbs that can be expected to last less than 1620hr is %. (Round to two decimal places as needed.)

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