How are these numbers calculated?

Big Games

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

Week of 7/30100.0*Chance in playoffs100.0*Average seed
Southern 2 Botany 3 +8.7
+0.2
Dunedin 4 Canterbury 7 -4.4
-0.1
Dunedin 5 Canterbury 7 -3.9
-0.1
Week of 8/6100.0*Chance in playoffs100.0*Average seed
Canterbury 13 Botany 4 Out
-0.4
West Auckland 6 Southern 3 -3.2
-0.2
Canterbury 6 Botany 1 -0.1
West Auckland 5 Southern 3 -0.1
Week of 8/13None
Points
Chance Will Make Playoffs