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Suppose the heights of 18-year-old men are approximately normally distributed, with mean 68 inches and standard deviation...

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Statistics

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.)

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