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 -14.9
-0.9
Bangu 1 Portuguesa 1 +2.5
+0.1
Week of 3/7100.0*Chance in playoffs100.0*Average seed
Portuguesa 2 Nova Iguacu 1 -5.1
-0.1
Portuguesa 1 Cabofriense 2 +4.0
+0.2
Boavista 0 Flamengo 3 +3.5
+0.0
Volta Redonda 1 Botafogo 1 -3.1
-0.3
Vasco da Gama 0 Fluminense 0 +1.8
+0.1
Fluminense 2 Nova Iguacu 1 -0.8
-0.2
Week of 3/17100.0*Chance in playoffs100.0*Average seed
Botafogo 2 Vasco da Gama 3 -23.6
-1.0
Flamengo 4 Portuguesa 0 In
+0.1
Cabofriense 1 Fluminense 1 -0.1
Points
Chance Will Make Playoffs