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a (1 point) Fluorescent lighbulbs have lifetimes that follow a normal distribution, with an average life of 1,534 days and a standard deviation of 1,756

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a (1 point) Fluorescent lighbulbs have lifetimes that follow a normal distribution, with an average life of 1,534 days and a standard deviation of 1,756 hours. In the production process the manufacturer draws random samples of 408 lightbulbs and determines the mean lifetime of the sample. What is the standard deviation, in hours, of this sample mean

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