Question: The time that it takes a random person to get a haircut is normally distributed, with an average of 23.8 minutes and a standard deviation

The time that it takes a random person to get a haircut is normally distributed, with an average of 23.8 minutes and a standard deviation of 5 minutes. Assume that different people have independent times of getting their hair cut. Find the probability that, if there are four customers I in a row (with no gaps in between), they will all be finished getting their hair cut in 1.5 hours (altogether) or less.

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