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 +22.4
+0.4
Atlético Madrid 1 Rayo Vallecano 0 -12.9
-0.2
Real Sociedad 0 Real Madrid 1 -9.4
-0.2
Week of 5/13None
Week of 5/15100.0*Chance wins title100.0*Average seed
Deportivo 0 Real Madrid 2 -38.4
-0.4
Granada 0 Barcelona 3 Yes
+0.2
Points
Chance Will Win Championship