How are these numbers calculated?

Big Games

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

Week of 4/10100.0*Chance in playoffs100.0*Average seed
Real Potosi 3 Parana 1 -15.5
-0.2
Week of 4/18100.0*Chance in playoffs100.0*Average seed
Parana 2 Union Maracaibo 1 +19.4
+0.2
Flamengo 1 Real Potosi 0 +17.4
+0.2
Week of 4/24None
Points
Chance Will Make Playoffs