How are these numbers calculated?

Big Games

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

Week of 7/23100.0*Chance in playoffs100.0*Home Advantage100.0*Average seed
Botany 5 West Auckland 3 -3.7
-4.0
-0.1
Botany 5 West Auckland 1 -1.1
-2.7
Week of 7/30100.0*Chance in playoffs100.0*Home Advantage100.0*Average seed
West Auckland 3 Southern 6 +20.4
+0.2
West Auckland 1 Southern 6 +15.2
+1.2
+0.2
Dunedin 5 Botany 6 No
Week of 8/6100.0*Chance in playoffs100.0*Home Advantage100.0*Average seed
Dunedin 4 Southern 8 In
+0.3
Canterbury 9 West Auckland 5 -27.0
-0.3
Dunedin 3 Southern 5 +23.0
+0.2
Canterbury 7 West Auckland 2 -20.9
-0.2
Points
Chance Will Make Playoffs