How are these numbers calculated?

Big Games

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

Week of 10/24100.0*Chance in playoffs100.0*Serie B100.0*Average seed
Vasco da Gama 0 Vitoria 1 +7.5
No
+2.0
Vasco da Gama 3 Coritiba 1 -1.5
-0.2
Gremio 2 America-RN 1 -0.8
-0.2
Cruzeiro 3 Palmeiras 1 -0.7
-0.2
Portuguesa 1 Internacional 1 +0.5
Flamengo 2 Guarani 1 -0.4
-0.0
America-MG 2 Atletico-PR 1 +0.4
+0.1
Coritiba 1 Atletico-MG 1 +0.3
Sport Recife 2 Botafogo 1 -0.2
+0.1
Sao Paulo 1 Corinthians 2 +0.1
+0.1
Goias 2 Juventude 2 +0.1
Ponte Preta 2 Bragantino 2 +0.1
Week of 10/31100.0*Chance in playoffs100.0*Serie B100.0*Average seed
Vitoria 2 Corinthians 3 -9.0
-1.3
Internacional 0 Botafogo 0 +1.3
+0.1
Flamengo 2 America-MG 0 -0.1
-0.2
Atletico-PR 1 Cruzeiro 2 -0.1
+0.1
Atletico-MG 1 Sport Recife 0 -0.1
-0.1
Guarani 1 Gremio 3 -0.1
Week of 11/7100.0*Chance in playoffs100.0*Serie B100.0*Average seed
Coritiba 1 Internacional 0 +0.2
Sao Paulo 2 Atletico-PR 0 +0.1
Points
Chance Will Make Playoffs