Question: The heights of a large group of people are assumed to be normally distributed. Their mean height is 68 inches and the standard deviation is 4 inches. What probability that a randomly chose person is

(a) Taller than 73 inches

(b) Between 62 and 72 inches

If you choose 4 persons randomly, what is the probability that the average height of them is

(c) Greater than 73 inches

(d) Between 62 and 72 inches