How are these numbers calculated?

Big Games

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

Week of 7/21100.0*Chance in playoffs100.0*Average seed
Botany 2 Dunedin 8 +40.4
+0.4
Botany 5 Dunedin 6 +22.2
+0.2
Dunedin 1 Skycity 5 -3.7
-0.0
Week of 7/28100.0*Chance in playoffs100.0*Average seed
West Auckland 6 Botany 3 +8.8
+0.1
West Auckland 6 Botany 0 +5.1
+0.1
Dunedin 4 Skycity 5 -4.2
-0.0
Week of 8/4100.0*Chance in playoffs100.0*Average seed
Botany 0 Skycity 7 In
+0.0
Points
Chance Will Make Playoffs