How are these numbers calculated?

Big Games

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

Week of 11/26100.0*Average seed
Coritiba 0 Vitoria 1 +0.2
Botafogo 1 Ponte Preta 1 +0.1
America-MG 2 Sport Recife 2 +0.1
Corinthians 0 Atletico-PR 0 -0.0
Week of 12/4100.0*Average seed
Cruzeiro 3 Corinthians 2 +1.2
Sao Paulo 5 Santa Cruz 0 -0.2
Fluminense 1 Internacional 1 +0.1
Vitoria 1 Palmeiras 2 +0.1
Ponte Preta 2 Coritiba 0 -0.1
Points
Chance Will Win Championship