How are these numbers calculated?

Big Games

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

Week of 7/20100.0*Segunda Division B100.0*Average seed
Cadiz 0 Albacete 1 +40.5
-0.5
Lugo 2 Mirandes 1 No
+0.5
Numancia 2 Tenerife 1 +1.8
-0.2
Almeria 0 Malaga 0 -0.1
Week of 8/7None
Points
Chance Will Win Championship