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PLEASE HELP the boeing 757-200 ER airliner carries 200 passengers and has doors with a height...

PLEASE HELP
the boeing 757-200 ER airliner carries 200 passengers and has doors with a height of 72 inches. heights of men are normally distributed with a mean of 69.0 inches and a standard deviation of 2.8 inches. if half of the 200 passengers are men find the probability that the mean height of the 100 men is less than 72 inches

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