2. Suppose your school is in the midst of a flu epidemic. The probability that a randomly-selected student has the flu is 0.15,
and the probability that a student who has the flu also has a
high fever is 0.90. But there are other illnesses making the
rounds, and the probability that a student who doesn't have the
flu does have a high fever (as a result of some other ailment) is
0.10.