The time needed to complete a final examination in a particularcollege course is normally distributed with a mean of 100 minutesand a standard deviation of 20 minutes. Answer the followingquestions.
(a)What is the probability of completing the exam in one hour orless?
(b) What is the probability that a student will complete theexam in more than 60 minutes but less than 75 minutes?
(c) Assume that the class has 90 students and that theexamination period is 130 minutes in length. How many students doyou expect will be unable to complete the exam in the allottedtime
