How are these numbers calculated?

Big Games

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

Week of 5/16100.0*Chance in playoffs100.0*Average seed
Lanus 3 Chapecoense 0 +3.7
+0.0
Zulia 0 Nacional 0 -0.3
-0.0
Week of 5/24None
Points
Chance Will Make Playoffs