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The time it takes for a statistics professor to mark a single midterm test is normally distributed with a mean of 4.6 minutes and a

The time it takes for a statistics professor to mark a single midterm test is normally distributed with a mean of 4.6 minutes and a standard deviation of 2.5 minutes. There are 63 students in the professor's class. What is the probability that he needs more than 5 hours to mark all of the midterm tests?

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