How are these numbers calculated?

Big Games

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

Week of 8/14100.0*Chance in playoffs100.0*Average seed
West Auckland 6 Canterbury 5 Out
Southern 3 Dunedin 4 (ot)+3.2
+0.4
Southern 2 Dunedin 13 +1.7
+0.3
West Auckland 8 Canterbury 7 (ot)-0.4
Southern 2 Botany 4 +0.1
Week of 8/21100.0*Chance in playoffs100.0*Average seed
Canterbury 13 Dunedin 7 -0.3
Southern 2 Botany 1 (so)-0.3
Canterbury 9 Dunedin 1 -0.2
Points
Chance Will Make Playoffs