Based on past results found in the Information please Almanac, there is a 0.1919 probability that a baseball World Series contest will last four games, a 0.2121 probability that it will last five games, a 0.2222 probability that it will last six games, and a 0.3738 probability that it will last seven games. If you wanted to find the average number of games to win the World Series, which method would you use? Add the games (4, 5, 6, 7) and divide by 4.
Find the mean of a probability distribution.
Find the mean of a binomial distribution.
Add the probabilities and divide by 4.