How are these numbers calculated?

Big Games

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

Week of 4/3100.0*Chance in playoffs100.0*Average seed
Nova Iguacu 1 Volta Redonda 0 -9.2
-0.3
Vasco da Gama 2 Friburguense 1 +6.3
+0.1
Vasco da Gama 0 Botafogo 3 -2.4
-0.1
Botafogo 3 Olaria 0 -1.5
-0.1
Week of 4/10100.0*Chance in playoffs100.0*Average seed
Botafogo 4 Nova Iguacu 1 In
-0.1
Botafogo 3 Friburguense 1 +5.2
-0.1
Friburguense 2 Madureira 2 +1.8
Volta Redonda 0 Olaria 0 -1.6
-0.0
Week of 4/21None
Points
Chance Will Make Playoffs