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Basic Statistics and Probability

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The amount of annual snowfall in a certain mountain range is normally distributed with a mean of 109 inches, and a standard deviation of 10 inches.

a. What is the probability that the mean annual snowfall during 40 randomly picked years will exceed 111.8 inches?
b. What is the probability that the mean annual snowfall during 40 randomly picked years will be between 105 inches and 112 inches?

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This solution gives the step by step method for computing probabilities based on Z score.

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The amount of annual snowfall in a certain mountain range is normally distributed with a mean of 109 inches, and a standard deviation of 10 ...

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