How are these numbers calculated?

Big Games

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

Week of 3/3100.0*Chance in playoffs100.0*Average seed
Flamengo 1 Botafogo 0 -11.2
-0.7
Bangu 1 Portuguesa 1 +3.1
+0.1
Week of 3/7100.0*Chance in playoffs100.0*Average seed
Volta Redonda 1 Botafogo 1 -9.7
-0.6
Portuguesa 1 Cabofriense 2 +3.6
+0.1
Portuguesa 2 Nova Iguacu 1 -2.5
-0.1
Boavista 0 Flamengo 3 +1.7
+0.0
Vasco da Gama 0 Fluminense 0 +1.3
+0.1
Fluminense 2 Nova Iguacu 1 -0.1
-0.1
Week of 3/17100.0*Chance in playoffs100.0*Average seed
Botafogo 2 Vasco da Gama 3 -16.2
-0.9
Flamengo 4 Portuguesa 0 In
+0.1
Cabofriense 1 Fluminense 1 -0.1
Points
Chance Will Make Playoffs