How are these numbers calculated?

Big Games

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

Week of 11/20100.0*Average seed
Sport Recife 2 Ponte Preta 1 +0.1
Brasil de Pelotas 2 Atletico-GO 2 +0.1
Week of 11/24None
Week of 11/29100.0*Average seed
Figueirense 1 Operario-PR 1 -0.5
Cuiaba 1 Vila Nova 2 +0.2
Parana 3 Botafogo-SP 3 +0.0
Points
Chance Will Win Championship