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 -3.4
-14.7
-0.2
Botany 5 West Auckland 1 -1.8
-13.8
-0.2
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 -14.8
-0.4
-0.2
Dunedin 5 Botany 6 -0.3
No
-0.1
Week of 8/6100.0*Chance in playoffs100.0*Home Advantage100.0*Average seed
Dunedin 4 Southern 8 Out
-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