How are these numbers calculated?

Big Games

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

Week of 8/6100.0*Chance in playoffs100.0*Average seed
Alliston 1 EG Rangers 4 -12.9
-0.6
Orillia 2 OSS 2 +5.1
+0.1
Bradford 3 OSU 1 -3.6
Week of 8/13100.0*Chance in playoffs100.0*Average seed
Alliston 2 OSU 1 In
+0.6
Orillia 2 EG Rangers 3 +7.5
+0.0
Collingwood 5 Bradford 0 +5.1
+0.1
OSU 2 Orillia 2 +2.3
+0.1
Orillia 3 Alliston 3 -1.5
-0.1
EG Rangers 5 OSS 1 -1.4
-0.1
Week of 8/20100.0*Chance in playoffs100.0*Average seed
EG Rangers 1 Alliston 4 +0.7
Bradford 2 EG Rangers 4 -0.5
OSU 1 Bradford 0 -0.2
Points
Chance Will Make Playoffs