How are these numbers calculated?

Big Games

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

Week of 5/3100.0*Average seed
Vitoria Setubal 2 Leixoes 0 +0.3
Belenenses 1 Guimaraes 1 +0.1
Maritimo 2 Uniao Leiria 0 -0.1
Week of 5/10100.0*Average seed
Leixoes 0 Maritimo 1 -0.5
CD Nacional 1 Belenenses 2 -0.4
Benfica 3 Vitoria Setubal 0 -0.2
Points
Chance Will Win Championship