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The time needed to complete a final examination in an introductory microeconomics MBA course at UC Berkeley is normally distributed with a mean of 80

The time needed to complete a final examination in an introductory microeconomics MBA course at UC Berkeley is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes.

What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes?

Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time?

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