The time it takes for a statistics professor to mark
The time it takes for a statistics professor to mark his midterm test is normally distributed with a mean of 4.8 minutes and a standard deviation of 1.3 minutes.
There are 60 students in the professor’s class. What is the probability that he needs more than 5 hours to mark all the midterm tests? (The 60 midterm tests of the students in this year’s class can be considered a random sample of the many thousands of midterm tests the professor has marked and will mark.)

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