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The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 70 inches and as standard deviation of 20

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The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 70 inches and as standard deviation of 20 inches. What is the probability that the mean annual snowfall during 25 randomly picked years will exceed 72.8 inches? Assume the population is normally distributed. Round to 4. decimal places

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