he amount of time it takes an Intro to Statistics instructor to grade an individual test is a random variable with expected value 3 minutes and standard deviation 1 minute. She has 64 test to grade and begins grading at 7:40 PM. Question 1. What is the probability that she is finished grading by the beginning of the 11:00 PM news? . Question 2. What is the probability that she is finished grading by the beginning of the 11:10 PM sports report?.