You may need to use the appropriateappendix tableto answer this question. The time needed to complete a final examination in a particular college course is normally distributed with a mean of80 minutesand a standard deviation of10 minutes.Answer the following questions.

(a)What is the probability of completing the exam in one hour or less? (Round your answer to four decimal places.)

(b)What is the probability that a student will complete the exam in more than 60 minutes but less than65minutes? (Round your answer to four decimal places.)

(c)Assume that the class has80students and that the examination period is90minutes in length. How many students do you expect will be unable to complete the exam in the allotted time? (Round your answer up to the nearest integer.)

? students