Question: A professor grades his students on a normal distribution, with mean at 75 and standard deviation of 15. If there are 39 students in his

A professor grades his students on a normal distribution, with mean at 75 and standard deviation of 15. If there are 39 students in his class, about how many score between 80 and 90? Select one: O a. 8 b. 21 De None of the others e. 13

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