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 -19.2
-1.5
Vasco da Gama 3 Coritiba 1 +18.9
No
+1.7
Cruzeiro 3 Palmeiras 1 -3.2
-0.2
Flamengo 2 Guarani 1 -1.8
-0.1
Gremio 2 America-RN 1 -1.5
-0.1
America-MG 2 Atletico-PR 1 +1.5
+0.1
Sport Recife 2 Botafogo 1 -0.3
Portuguesa 1 Internacional 1 +0.3
Coritiba 1 Atletico-MG 1 +0.3
+0.0
Goias 2 Juventude 2 +0.1
Sao Paulo 1 Corinthians 2 +0.0
Bragantino 1 Juventude 0 +0.0
Week of 10/31100.0*Chance in playoffs100.0*Serie B100.0*Average seed
Atletico-MG 1 Sport Recife 0 -6.4
-0.2
Atletico-PR 1 Cruzeiro 2 -5.5
-0.2
Internacional 0 Botafogo 0 +3.3
+0.2
Guarani 1 Gremio 3 -3.3
-0.1
Flamengo 2 America-MG 0 -3.2
-0.2
Vitoria 2 Corinthians 3 +1.0
+0.1
Week of 11/7100.0*Chance in playoffs100.0*Serie B100.0*Average seed
Goias 2 Vasco da Gama 2 -30.7
-0.6
Palmeiras 2 Vasco da Gama 1 -19.8
-0.8
Cruzeiro 5 Juventude 0 -13.8
-0.3
Ponte Preta 0 Atletico-MG 0 +10.8
+0.2
Parana 2 Flamengo 1 +3.3
+0.3
Gremio 4 Portuguesa 2 -2.4
-0.3
Coritiba 1 Internacional 0 +0.7
+0.2
Points
Chance Will Make Playoffs