How are these numbers calculated?

Big Games

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

Week of 11/21100.0*Serie B100.0*Average seed
Corinthians 2 Nautico 3 -4.2
+0.4
Botafogo 3 Sao Paulo 2 +3.8
-0.1
Sport Recife 0 Fluminense 3 +2.9
-0.2
Santos 4 Coritiba 0 -0.5
Vitoria 2 Barueri 1 +0.3
Santo Andre 4 Avai 2 +0.2
-0.2
Atletico-PR 1 Cruzeiro 1 +0.1
Week of 11/29100.0*Serie B100.0*Average seed
Santo Andre 5 Nautico 3 Yes
-0.5
Fluminense 4 Vitoria 0 +1.3
-0.1
Cruzeiro 4 Coritiba 1 -0.7
Atletico-PR 2 Botafogo 0 -0.7
Week of 12/5100.0*Serie B100.0*Average seed
Nautico 0 Avai 1 -0.1
Points
Chance Will Win Championship