How are these numbers calculated?

Big Games

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

Week of 8/2100.0*Chance in playoffs100.0*League100.0*Average seed
Dunedin 6 Botany 5 +10.6
+12.8
+0.2
Dunedin 5 Botany 4 +1.7
+12.4
+0.1
West Auckland 2 Canterbury 5 -0.7
-10.9
-0.1
West Auckland 5 Canterbury 7 -12.4
-0.1
Week of 8/9100.0*Chance in playoffs100.0*League100.0*Average seed
Canterbury 6 Dunedin 1 -28.6
-0.3
Botany 7 Southern 6 (ot)In
Canterbury 6 Dunedin 0 -23.9
-0.2
Week of 8/16100.0*Chance in playoffs100.0*League100.0*Average seed
West Auckland 7 Dunedin 8 +7.4
+0.1
Southern 4 Canterbury 5 No
-0.0
Points
Chance Will Make Playoffs