How are these numbers calculated?

Big Games

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

Week of 11/20100.0*Chance wins title100.0*Average seed
Internacional 1 Flamengo 2 +3.9
+0.1
Atletico-MG 2 Juventude 0 -3.1
Gremio 2 Flamengo 2 -1.7
Palmeiras 2 Atletico-MG 2 +0.3
Fortaleza 1 Palmeiras 0 +0.0
Week of 11/27100.0*Chance wins title100.0*Average seed
Atletico-MG 2 Fluminense 1 -1.7
Bahia 2 Atletico-MG 3 No
Flamengo 2 Ceara 1 +0.5
Week of 12/5None
Points
Chance Will Win Championship