How are these numbers calculated?

Big Games

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

Week of 10/3100.0*Chance in playoffs100.0*Average seed
Salisbury 10 Bev Facey 8 -9.4
-0.8
Spruce Grove 52 Jasper Place 27 +1.0
+0.1
Week of 10/10100.0*Chance in playoffs100.0*Average seed
Bev Facey 31 Harry Ainlay 28 In
+1.2
Salisbury 21 AOB 14 +12.4
+0.2
Bellerose 14 Spruce Grove 31 -1.9
+0.0
Jasper Place 63 Ross Shep 10 -0.2
-0.2
Week of 10/17100.0*Chance in playoffs100.0*Average seed
Spruce Grove 49 Bev Facey 6 -1.7
Ross Shep 0 AOB 43 +0.1
Bellerose 7 Jasper Place 30 -0.1
Salisbury 20 Harry Ainlay 29 -0.1
Games Above .500
Chance Will Make Playoffs