Question: 7. The time needed to complete a certain examination in a particular college course is normally distributed with a mean of 60 minutes and a

7. The time needed to complete a certain examination in a particular college course is normally distributed with a mean of 60 minutes and a standard deviation of 10 minutes. Answer the following questions.

a. What is the probability of completing the exam in 50 minutes or less?

b. What is the probability that a student will complete the exam in more than 45 minutes but less than 60 minutes?

c. Assume that the class has 40 students and that the examination time allowed period is 70 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time?

d. Calculate the 90th percentile completion time.

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