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 -55.2
+1.0
Numancia 2 Tenerife 1 +9.1
-0.2
Lugo 2 Mirandes 1 +7.7
-0.2
Week of 8/7None
Points
Chance Will Win Championship