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
Boca Juniors 5 Alianza Lima 0 +15.4
+0.2
Palmeiras 3 Junior Barranquilla 1 +12.6
+0.1
Week of 5/22None
Points
Chance Will Make Playoffs