18. Boxes of Wheaties cereal currently include a picture card of a famous
athelete. Each of the Seven Superstars has a different chance of being
found in a randomly selected box of cereal. The probability of obtaining
your favorite superstar, Peyton Manning, is known to be 0.16.
(a) How many boxes of Wheaties would you expect to have to
purchase before getting your first picture card of Peyton Manning?
(b)
What is the probability that you have to purchase exactly 3 boxes of
cereal to obtain your first picture card of Peyton Manning? (Round
answer to the nearest tenth of a percent.)