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
Santo Andre 4 Avai 2 -4.3
+0.5
Botafogo 3 Sao Paulo 2 +1.3
Sport Recife 0 Fluminense 3 +0.9
Santos 4 Coritiba 0 -0.1
Atletico-PR 1 Cruzeiro 1 +0.1
Corinthians 2 Nautico 3 -0.2
Week of 11/29100.0*Serie B100.0*Average seed
Santo Andre 5 Nautico 3 -2.5
+0.6
Fluminense 4 Vitoria 0 +1.1
-0.1
Atletico-PR 2 Botafogo 0 -0.8
Cruzeiro 4 Coritiba 1 -0.4
Week of 12/5100.0*Serie B100.0*Average seed
Botafogo 2 Palmeiras 1 Yes
-0.1
Coritiba 1 Fluminense 1 Yes
-0.1
Internacional 4 Santo Andre 1 Yes
-0.2
Nautico 0 Avai 1 +0.0
Points
Chance Will Win Championship