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 -15.5
-0.6
Cerro Porteno 1 Rosario Central 3 +6.1
+0.1
Week of 4/11100.0*Chance in playoffs100.0*Average seed
Rosario Central 1 Atletico Nacional 2 In
+0.6
Palmeiras 2 Cerro Porteno 3 -4.8
-0.0
Week of 4/19None
Points
Chance Will Make Playoffs