How are these numbers calculated?

Big Games

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

Week of 8/19100.0*Chance in playoffs100.0*Average seed
DragonSlayers 5 YYZ 4 +0.0
Winterhawks 8 IceDogs 3 -1.2
PeterNorthstars 5 DirtyMikeandtheBoys 6 -0.1
Hagen 8 SlapShot 6 In
CarpetAngels 4 PuckBuddies 5 +0.2
FraminghamJets 4 Lumberhacks 3 +0.1
Week of 8/26100.0*Chance in playoffs100.0*Average seed
SlapShot 8 IceDogs 4 -0.8
Winterhawks 2 PeterNorthstars 2 (ot)+0.4
CarpetAngels 6 DirtyMikeandtheBoys 2 -0.4
FraminghamJets 8 YYZ 1 +0.2
Hagen 6 CarpetAngels 6 (ot)-0.0
Week of 9/5None
Points
Chance Will Make Playoffs