Suppose the heights of 18-year-old men are approximatelynormally distributed, with mean 68 inches and standarddeviation 3inches.
(a) What is the probability that an 18-year-old man selected atrandom is between 67 and 69 inches tall? (Round your answer to fourdecimal places.)
(b) If a random sample of eleven 18-year-old men is selected, whatis the probability that the mean height x is between 67and 69 inches? (Round your answer to four decimal places.)
