The distributions of the grades of the students of

Chapter , Problem 16

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The distributions of the grades of the students of probability and calculus at a certain university are N (65, 418) and N (72, 448), respectively. Dr. Olwell teaches a calculus section with 28 and a probability section with 22 students. What is the probability that the difference between the averages of the final grades of these two classes is at least 2?

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