How are these numbers calculated?

Big Games

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

Week of 4/5100.0*Chance in playoffs100.0*Average seed
Independiente del Valle 3 Atletico-MG 2 +20.5
+0.5
Melgar 1 Colo-Colo 2 -19.9
-0.2
Week of 4/12100.0*Chance in playoffs100.0*Average seed
Colo-Colo 0 Independiente del Valle 0 In
+0.3
Atletico-MG 4 Melgar 0 -6.0
-0.3
Week of 4/19None
Points
Chance Will Make Playoffs