The lengths of time, x, spent commuting daily, one-way, to college by students are believed to have a mean of 22 min with a standard deviation of 9 min. If the lengths of time spent commuting are approximately normally distributed, find the time, x, that separates the 25% who spend the most time commuting from the rest of the commuters.

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a. b. 0.3100 Z(x) 0 0.2170 0 200