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The time it takes for a statistics professor to mark a single midterm test is normally...

The time it takes for a statistics professor to mark a single midterm test is normally distributed with a mean of 4.9 minutes and a standard deviation of 1.7 minutes. There are 57 students in the professor's class. What is the probability that he needs more than 5 hours to mark all of the midterm tests?

Math   Statistics-And-Probability   
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Answer #1

Given that, mean = 4.9 minutes

standard deviation = 1.7 minutes

sample size ( n ) = 57

We want to find,

Therefore, required probability is 0.3300

Note: If we used TI-84 calculator then we get, probability is 0.3285

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