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The time it takes students to complete a quiz is Normally distributed with a mean of...

The time it takes students to complete a quiz is Normally distributed with a mean of 45 minutes and a standard deviation of 4 minutes.  

a)What percent of all students take longer than 50 minutes to complete the quiz? Round your answer to the nearest whole percent. Don't write the percent symbol in your answer.

b)If you take a sample of 30 students, what is the probability that the average amount of time needed to complete the quiz for this group is more than 50 minutes? Write your answer as a

Math   Statistics-And-Probability   
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