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 2 Friburguense 1 +15.8
+0.3
Nova Iguacu 1 Volta Redonda 0 -14.7
-0.4
Botafogo 3 Olaria 0 -2.4
-0.1
Vasco da Gama 0 Botafogo 3 -1.7
-0.1
Week of 4/10100.0*Chance in playoffs100.0*Average seed
Botafogo 3 Friburguense 1 +7.3
-0.0
Botafogo 4 Nova Iguacu 1 In
+0.0
Week of 4/21None
Points
Chance Will Make Playoffs