There are 40 students in an elementary statistics claSs. On he 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 pm and grades continously, what is the (approx) probability that he is through graDing before the 11:00 pm TV news begins? b) If the sports report begins at 11:10, what is the probability that he misses part of the report if he waits until grading is done before turning on the TV? (We have to use CLT).
Elementary statistics class
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