There are 40 students in an elementary statistics class. on the basis of years of experience, the instructor knows that the time needed to grade a randomly chosen first examination paper is a random variable with an expected value of 6 min and a standard deviation of 6 min.a. if grading times are independent and the instructor begins grading at 6:50 p.m. and grades continuously, what is the (approximate) probability that he is through grading before the 11:00 p.m. tv news begins?b. if the sports report begins at 11:10, what is the prob-ability that he misses part of the report if he waits until grading is done before turning on the tv?
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