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
Rosario Central 3 Palmeiras 3 +7.5
+0.2
River Plate-URU 2 Nacional 2 +5.1
-0.0
Week of 4/12100.0*Chance in playoffs100.0*Average seed
Palmeiras 4 River Plate-URU 0 -22.8
-0.2
Nacional 0 Rosario Central 2 In
+0.8
Week of 4/19None
Points
Chance Will Make Playoffs