How are these numbers calculated?

Big Games

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

Week of 7/27100.0*Chance in playoffs100.0*Average seed
Canterbury 7 Southern 4 Out
-0.1
Southern 10 West Auckland 2 +2.1
+0.2
Week of 8/10None
Points
Chance Will Make Playoffs