If the population standard deviation of the lifetime of washing machines is estimated to be 1000 hours, how large a sample must be taken in order to be 95% confident that the margin of error will not exceed 100 hours?

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The Answer of If the population standard deviation of the lifetime of washing machines is estimated to be 1000 hours, how large a sample must be taken in order to be 95% confident that the margin of error will not exceed 100 hours?

If the Population Standard Deviation of the Lifetime of Washing