The average amount of percipitation in Dallas, throughout the month of april is 3.5 inches. Suppose that a normal distribution applies and that the standard deviation is .8 inches.
a. What % of the time does the amount of rainfall in April exceeds 5 inches?
b. What % of the time is 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% for that month. How much percipitation should fall in April for it to be classified as extremely wet?