How are these numbers calculated?

Big Games

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

Week of 3/20100.0*Chance in playoffs100.0*Average seed
America 3 Boavista 2 +21.9
+0.6
Vasco da Gama 2 Americano 3 +14.0
+0.2
Bangu 1 America 1 -7.2
-0.2
Olaria 1 Vasco da Gama 0 +6.2
+0.1
Americano 2 Macae 1 +3.8
+0.2
Volta Redonda 0 Botafogo 1 -3.5
-0.2
Macae 3 Olaria 1 -1.8
-0.1
Flamengo 3 Tigres do Brasil 1 +0.7
+0.0
Botafogo 2 Flamengo 2 -0.5
-0.0
Tigres do Brasil 3 Volta Redonda 0 -0.3
-0.1
Week of 3/27100.0*Chance in playoffs100.0*Average seed
Vasco da Gama 3 Fluminense 0 -21.1
-0.3
Flamengo 2 America 1 -10.6
-0.2
Macae 2 Duque de Caxias 2 +7.0
+0.1
Boavista 1 Botafogo 4 -4.4
-0.1
Bangu 2 Tigres do Brasil 1 +0.5
+0.0
Week of 4/3100.0*Chance in playoffs100.0*Average seed
America 2 Volta Redonda 0 +27.7
+0.4
Duque de Caxias 3 Vasco da Gama 4 Out
-0.2
Fluminense 3 Macae 1 +0.1
Points
Chance Will Make Playoffs

Lottery

We are out of the playoffs. Here are the big games and what ifs for draft seeds.
Although it might be more fun to go down swinging.

Big Games

Week of 3/20100.0*Lottery seed
America 3 Boavista 2 -1.9
Vasco da Gama 2 Americano 3 -0.6
Bangu 1 America 1 +0.5
Volta Redonda 0 Botafogo 1 +0.3
Americano 2 Macae 1 -0.2
Olaria 1 Vasco da Gama 0 -0.2
Resende 1 Duque de Caxias 0 -0.1
Boavista 0 Friburguense 1 -0.1
Macae 3 Olaria 1 +0.1
Friburguense 2 Bangu 3 +0.1
Flamengo 3 Tigres do Brasil 1 -0.0
Tigres do Brasil 3 Volta Redonda 0 -0.0
Botafogo 2 Flamengo 2 +0.0
Week of 3/27100.0*Lottery seed
Flamengo 2 America 1 +0.7
Vasco da Gama 3 Fluminense 0 +0.7
Macae 2 Duque de Caxias 2 -0.3
Resende 2 Olaria 0 -0.1
Volta Redonda 1 Friburguense 1 -0.1
Madureira 0 Americano 0 -0.1
Boavista 1 Botafogo 4 +0.1
Bangu 2 Tigres do Brasil 1 +0.0
Week of 4/3100.0*Lottery seed
America 2 Volta Redonda 0 -1.4
Tigres do Brasil 1 Boavista 3 +0.3
Olaria 1 Madureira 2 -0.3
Duque de Caxias 3 Vasco da Gama 4 +0.2
Fluminense 3 Macae 1 -0.1
Americano 2 Resende 0 +0.1