How are these numbers calculated?

Big Games

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

Week of 4/2100.0*Chance in playoffs100.0*Average seed
Nacional 4 Toluca 0 In
+0.5
Boca Juniors 1 Barcelona 0 -1.9
-0.1
Week of 4/9None
Week of 4/16100.0*Chance in playoffs100.0*Average seed
Barcelona 1 Nacional 0 -0.4
Toluca 3 Boca Juniors 2 +0.2
Points
Chance Will Make Playoffs