How are these numbers calculated?

Big Games

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

Week of 3/11100.0*Chance in playoffs100.0*Seletiva100.0*Average seed
Boavista 0 Fluminense 3 Out
+0.5
-0.2
Botafogo 2 Madureira 1 -0.6
-0.1
Week of 3/19100.0*Chance in playoffs100.0*Seletiva100.0*Average seed
Madureira 0 Flamengo 2 No
+0.0
Botafogo 4 Portuguesa 1 -0.2
Resende 0 Vasco da Gama 2 +0.1
Bangu 2 Americano 0 +0.0
Week of 3/23100.0*Chance in playoffs100.0*Seletiva100.0*Average seed
Volta Redonda 2 Boavista 4 +0.8
Portuguesa 2 Resende 1 +0.5
Americano 2 Botafogo 2 +0.1
Points
Chance Will Make Playoffs