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 +9.5
+0.8
Bangu 1 Portuguesa 1 +1.8
+0.1
Week of 3/7100.0*Chance in playoffs100.0*Average seed
Boavista 0 Flamengo 3 In
+0.6
Portuguesa 2 Nova Iguacu 1 -1.3
Vasco da Gama 0 Fluminense 0 +0.5
+0.1
Fluminense 2 Nova Iguacu 1 -0.1
Volta Redonda 1 Botafogo 1 +0.1
Week of 3/17100.0*Chance in playoffs100.0*Average seed
Cabofriense 1 Fluminense 1 +0.2
Flamengo 4 Portuguesa 0 +0.2
Points
Chance Will Make Playoffs