
Concept explainers
Football During the 1988 college football season, the Big Eight Conference ended the season in a “perfect progression,” as shown in the following table. Source: The American Statistician.
Won | Lost | Team |
7 | 0 | Nebraska (NU) |
6 | 1 | Oklahoma (OU) |
5 | 2 | Oklahoma State (OSU) |
4 | 3 | Colorado (CU) |
3 | 4 | Iowa State (ISU) |
2 | 5 | Missouri (MU) |
1 | 6 | Kansas (KU) |
0 | 7 | Kansas State (KSU) |
Someone wondered what the probability of such an outcome might be.
(a) How many games do the 8 teams play?
(b) Assuming no ties, how many different outcomes are there for all the games together?
(c) In how many ways could the 8 teams end in a perfect progression?
(d) Assuming that each team had an equally likely probability of winning each game, find the probability of a perfect progression with 8 teams.
(e) Find a general expression for the probability of a perfect progression in an n-team league with the same assumptions.

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