1. Suppose the time spent by UNCC students studying for math exams per week is normally distributed with a mean of 65 minutes and a standard deviation of 13 minutes. a. What is the probability that a randomly chosen student spends between 60 and 90 minutes per week studying for math exams? b. If 50 UNCC students are randomly selected, approximately how many are expected to study fewer than 20 minutes per week?

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