How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 4/14100.0*Chance in playoffs100.0*Average seed
Independiente Medellin 2 Sao Paulo 1 -10.5
America de Cali 0 Defensor Sporting 0 +3.5
Week of 4/21100.0*Chance in playoffs100.0*Average seed
Defensor Sporting 4 Independiente Medellin 3 In
Sao Paulo 2 America de Cali 1 +0.2
Week of 4/28None
Chance Will Make Playoffs