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*Average seed
Boavista 0 Fluminense 3 -0.1
Week of 3/19100.0*Chance in playoffs100.0*Average seed
Resende 0 Vasco da Gama 2 In
+0.5
Bangu 2 Americano 0 -1.4
-0.0
Madureira 0 Flamengo 2 -0.1
Cabofriense 1 Volta Redonda 1 +0.0
Week of 3/23100.0*Chance in playoffs100.0*Average seed
Vasco da Gama 1 Bangu 2 -0.5
Flamengo 3 Fluminense 2 +0.4
Points
Chance Will Make Playoffs