How are these numbers calculated?

Big Games

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

Week of 11/15100.0*Serie B100.0*Average seed
America-MG 1 Bahia 2 +19.3
-1.1
Santa Cruz 2 America-MG 1 +19.2
-1.3
Flamengo 1 Internacional 0 +5.5
-0.2
Coritiba 1 Santa Cruz 0 -4.1
+0.1
Sao Paulo 3 Flamengo 1 -4.0
+0.1
Sport Recife 1 Botafogo-SP 2 +3.6
-0.1
Gama 4 Atletico-PR 1 +2.2
-0.1
Botafogo-SP 2 Vitoria 0 +1.9
-0.1
Ponte Preta 1 Juventude 0 -1.7
+0.1
Portuguesa 1 Cruzeiro 3 +1.6
-0.1
Bahia 2 Gama 1 -1.3
+0.1
Botafogo 2 Corinthians 4 -0.7
Vasco da Gama 2 Gremio 0 *+0.1
-0.1
Juventude 1 Botafogo 3 -0.0
Sao Caetano 2 Guarani 0 +0.1
Cruzeiro 1 Sao Paulo 4 +0.1
Week of 11/24None
Week of 12/1100.0*Serie B100.0*Average seed
America-MG 1 Juventude 1 Yes
-0.2
Flamengo 2 Palmeiras 0 Yes
-0.2
Gama 5 Botafogo-SP 0 -8.5
+0.3
Guarani 1 Santa Cruz 2 +1.2
-0.3

* A starred number could be exactly 0 or just really small. The simulation did not run long enough to know.

Points
Chance Will Make Playoffs