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
Spruce Grove 52 Jasper Place 27 -4.9
Salisbury 10 Bev Facey 8 +1.6
+0.0
Week of 10/10100.0*Chance in playoffs100.0*Average seed
Bellerose 14 Spruce Grove 31 -9.8
-0.1
Bev Facey 31 Harry Ainlay 28 -2.9
+0.0
Salisbury 21 AOB 14 -2.8
-0.2
Jasper Place 63 Ross Shep 10 -1.2
-0.0
Week of 10/17100.0*Chance in playoffs100.0*Average seed
Salisbury 20 Harry Ainlay 29 Out
-0.8
Spruce Grove 49 Bev Facey 6 +13.9
Bellerose 7 Jasper Place 30 +13.9
+0.3
Ross Shep 0 AOB 43 +11.3
+0.1
Games Above .500
Chance Will Make Playoffs