Question: 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 .6 inches.

Answer the following questions using Excel.

a) What percent of the time does the amount of rainfall in April Exceed 5 inches?

b) What percent of time is the amount of rainfall in April less than 3 inches?

c) A month is classified as extremely wet if the amount of rainfall is in the upper 10% per the month. How much precipitation must fall in April for it to be classified as extremely wet?