There are 47 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 5 min and a standard deviation of 4 min. (Round your answers to four decimal places.)
(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 probability
that he misses part of the report if he waits until grading is done
before turning on the TV?
pls upvote...!!!
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