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 +9.1
+0.7
Bangu 1 Portuguesa 1 +3.0
+0.1
Week of 3/7100.0*Chance in playoffs100.0*Average seed
Boavista 0 Flamengo 3 In
+0.4
Portuguesa 2 Nova Iguacu 1 -0.7
Vasco da Gama 0 Fluminense 0 +0.1
+0.2
Volta Redonda 1 Botafogo 1 +0.1
Fluminense 2 Nova Iguacu 1 -0.1
Week of 3/17100.0*Chance in playoffs100.0*Average seed
Cabofriense 1 Fluminense 1 +0.3
Flamengo 4 Portuguesa 0 +0.3
Points
Chance Will Make Playoffs