How are these numbers calculated?

Big Games

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

Week of 5/2100.0*Chance wins title100.0*Average seed
Real Betis 0 Barcelona 2 +16.2
+0.3
Atlético Madrid 1 Rayo Vallecano 0 -5.5
-0.1
Real Sociedad 0 Real Madrid 1 -5.5
-0.1
Week of 5/13None
Week of 5/15100.0*Chance wins title100.0*Average seed
Granada 0 Barcelona 3 Yes
+0.2
Deportivo 0 Real Madrid 2 -14.8
-0.1
Points
Chance Will Win Championship