(c) Assume that the class has 80 students and that the examination period is 130 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time? Before finding the number of students who will be unable to complete the exam in 130 minutes, first find the probability that any student does not complete the exam in 130 minutes. If the student does not finish the exam in the first 130 minutes, then it will take more than 130 minutes to complete. As a probability statement, completing the exam in more than 130 minutes is Px 7130). X First convert the random variable x = 130 to a normal random variable z. Recall that the mean was given to be = 100 minutes and the standard deviation was given to be = 20 minutes. X- Z= 130-100