How are these numbers calculated?

Big Games

How we did yesterday and who we should root for today.   Explain

Thursday100.0*Chance in playoffs100.0*Average seed
Parana 1 Gremio 1 -2.8
-0.2
Sao Paulo 3 Vitoria 2 +2.3
+0.1
Fluminense 2 Portuguesa 0 -1.9
-0.1
Sunday100.0*Chance in playoffs100.0*Average seed
Gremio 1 Atletico-MG 0 In
+1.7
Ponte Preta 2 Fluminense 3 -17.9
-0.3
Gama 4 Coritiba 0 +10.7
+0.2
Cruzeiro 2 Goias 0 -6.6
-0.1
Sao Caetano 3 Santos 2 +0.1
Points
Chance Will Make Playoffs