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What is the probability of obtaining a score

Discussion:

Assume that the midterm's scores X are normally distributed. Let X have a mean of 72 and a standard deviation of 12. Then response the following three questions:

a. What is the probability of obtaining a score at least 90?

b. What is the probability of obtaining a score at most 75?

c. What is the probability of obtaining a score between 60 and 79?

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