How are these numbers calculated?

Big Games

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

Week of 10/20100.0*Relegated100.0*Average seed
Halmstad 1 Mjällby 0 +12.5
-0.3
Häcken 1 Halmstad 3 +12.5
-0.2
IFK Göteborg 0 Öster 0 -2.8
+0.1
Brommapojkarna 0 AIK 6 -0.9
Malmö 2 Brommapojkarna 1 -0.4
Week of 10/27100.0*Relegated100.0*Average seed
IFK Norrköping 1 Öster 1 +1.7
-0.0
Week of 11/3100.0*Relegated100.0*Average seed
Halmstad 2 Brommapojkarna 2 Yes
-0.1
Points
Chance Will Win Championship