How are these numbers calculated?

Big Games

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

Week of 11/23100.0*Chance wins title100.0*Promoted100.0*Average seed
Palmeiras 2 Ipatinga 0 +1.2
+24.1
+0.5
Vasco da Gama 1 Sao Paulo 2 No
Vitoria 4 Gremio 2 +0.3
+0.3
+0.1
Cruzeiro 3 Flamengo 2 -5.8
-0.1
Week of 11/30100.0*Chance wins title100.0*Promoted100.0*Average seed
Flamengo 3 Goias 3 +7.3
+0.1
Vitoria 0 Palmeiras 0 -5.6
-0.3
Internacional 1 Cruzeiro 0 +5.1
+0.2
Ipatinga 1 Gremio 4 -1.3
-0.2
Week of 12/7100.0*Chance wins title100.0*Promoted100.0*Average seed
Atletico-PR 5 Flamengo 3 Yes
+0.2
Palmeiras 0 Botafogo 1 -11.1
-0.4
Cruzeiro 4 Portuguesa 1 -11.1
-0.3
Points
Chance Will Win Championship