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 +7.5
+18.6
+0.3
Botany 5 West Auckland 1 +2.8
+16.6
+0.2
Week of 7/30100.0*Chance in playoffs100.0*Home Advantage100.0*Average seed
West Auckland 1 Southern 6 -0.4
-0.8
Dunedin 5 Botany 6 In
Yes
+0.1
Week of 8/6None
Points
Chance Will Make Playoffs