How are these numbers calculated?

Big Games

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

Week of 5/15100.0*Chance in playoffs100.0*Average seed
Libertad 0 Atletico Tucuman 0 In
+0.3
Penarol 2 The Strongest 0 -19.9
-0.2
Week of 5/22None
Points
Chance Will Make Playoffs