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Suppose the heights of 18-year-old men are approximately normally distributed , with mean71inches and standard deviation3inches. (a) What is the probability that an 18-year-old man

Suppose the heights of 18-year-old men are approximatelynormally distributed, with mean71inches and standard deviation3inches.

(a) What is the probability that an 18-year-old man selected at random is between70and72inches tall? (Round your answer to four decimal places.)

(b) If a random sample ofthirteen18-year-old men is selected, what is the probability that the mean heightxis between70and72inches? (Round your answer to four decimal places.)

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