Apply the 68-95-99.7 rule to answer the question.
-The annual precipitation for one city is normally distributed with a mean of 35.4 inches and a standard deviation of 3.9 inches. What percentage of years had precipitation between 23.7 inches and 47.1 inches?

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The 68-95-99.7 rule, also known as the empirical rule, states that for a normal distribution, approximately 68% of the data falls within one standard deviation of the mean, 95% within two standard deviations, and 99.7% within three standard deviations. The range from 23.7 inches to 47.1 inches encompasses the mean (35.4 inches) and extends beyond three standard deviations (3 x 3.9 = 11.7 inches) in both directions, covering virtually all possible outcomes (99.7%).

Apply the 68-95-99.7 Rule to Answer the Question