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(solution) There are 40 students in an elementary statistics class. On the
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
probability that he misses part of the report if
he waits until grading is done before turning
on the TV?
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