Mathematics, 15.04.2021 16:10, chaparoonie15

A study shows that the mean rainfall in a certain town in the United States is 26.9 inches per year with a standard deviation of 2.3 inches per year.
What is the probability that on a certain year, the amount of rainfall falls below 20 inches?

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A study shows that the mean rainfall in a certain town in the United States is 26.9 inches per year...