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
Vasco da Gama 0 Botafogo 3 +17.5
+0.6
Botafogo 3 Olaria 0 +16.0
+0.5
Vasco da Gama 2 Friburguense 1 +5.2
+0.1
Nova Iguacu 1 Volta Redonda 0 -0.2
+0.1
Week of 4/10100.0*Chance in playoffs100.0*Average seed
Botafogo 3 Friburguense 1 In
+0.3
Botafogo 4 Nova Iguacu 1 +0.2
Volta Redonda 0 Olaria 0 +0.0
Week of 4/21None
Points
Chance Will Make Playoffs