How are these numbers calculated?

Big Games

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

Week of 8/2100.0*Chance in playoffs100.0*Home Advantage100.0*Average seed
Canterbury 5 Southern 4 In
+17.2
+0.2
Canterbury 11 Southern 6 +19.0
+0.2
Week of 8/9100.0*Chance in playoffs100.0*Home Advantage100.0*Average seed
Dunedin 6 Canterbury 3 -25.0
-0.3
Botany 4 Southern 7 Yes
+0.2
Botany 6 Southern 1 -19.3
-0.2
Dunedin 0 Canterbury 8 +18.5
+0.2
Points
Chance Will Make Playoffs