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4. ASSIGNMENT: Bob's class just had a test, and the grades are normally distributed with a mean of 72 and a standard deviation of 6.

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4. ASSIGNMENT: "Bob's class just had a test, and the grades are normally distributed with a mean of 72 and a standard deviation of 6. Using the same procedure as we used in the previous questions, find the probability that a random student has a grade... a. Below 50 b. Above 50 C. Between 65 and 80

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