1. As studied, the average number of hours spent by senior high school students for their online classes a week is 25 hours with a standard deviation of 4 hours. Assuming that the study is true and the data is normally distributed. A. Find the probability that a randomly selected senior high school student spends more than 26 hours but less than 29 hours. B. Find the probability that a randomly selected senior high school student spends less than 21 hours or greater than 30 hours. C. Find the probability that a random sample of 12 senior high school students spends more than 24 hours.

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