The annual rainfall in Cleveland Ohio is normally distribute

The annual rainfall in Cleveland, Ohio, is normally distributed with mean 40 inches

and standard deviation 8 inches. Let X_i denote the rainfall in year i (i = 1,2,3,4) and assume that

rainfall is independent from year to year.

(a) Find the probability that the sum of the rainfall in the next four years exceeds 164 inches.

(b) Use Chebyshev\'s inequality to estimate P(16 < X₁ < 64) (the probability that the next year\'s

rainfall is between 16 and 64 inches). Also calculate this probability exactly using the normal distriburion.