A month is classified as extremely wet if the amount of, Ask an Expert

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The average amount of precipitation in Dallas, Texas, during the month of April is 3.5 inches (The World Almanac, 2000). Assume that a normal distribution applies and that the standard deviation is .8 inches.

a. What percentage of the time does the amount of rainfall in April exceed 5 inches?

b. A month is classified as extremely wet if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as extremely wet?

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