Suppose the heights of 18-year-old men are approximately normally distributed, with mean 70 inches and standard deviation 4 inches. l2 USE SALT (a) What is the probability that an 18-year-old man selected at random is between 69 and 71 inches tall? (Round your answer to four decimal places.) (b) If a random sample of eight 18-year-old men is selected, what is the probability that the mean height )7 is between 69 and 71 inches? (Round your answer to four decimal places.)