Mathematics, 16.03.2020 16:57 unkn03n78

Suppose X is the time it takes a randomly chosen clerical worker in an office to type and send a standard letter of recommendation. Suppose X has a normal distribution, and assume the mean is 10.5 minutes and the standard deviation 3 minutes. You take a random sample of 50 clerical workers and measure their times. What is the chance that their average time is less than 9.5 minutes?

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Suppose X is the time it takes a randomly chosen clerical worker in an office to type and send a sta...

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