How are these numbers calculated?

Big Games

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

Week of 4/4100.0*Chance in playoffs100.0*Average seed
Atletico Nacional 1 Palmeiras 2 +23.1
Cerro Porteno 1 Rosario Central 3 In
Week of 4/11100.0*Chance in playoffs100.0*Average seed
Rosario Central 1 Atletico Nacional 2 -0.3
Palmeiras 2 Cerro Porteno 3 -0.2
Week of 4/19None
Chance Will Make Playoffs