How are these numbers calculated?

Big Games

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

Week of 8/15100.0*Average seed
Canterbury 7 West Auckland 1 +0.1
Dunedin 1 Botany 9 +0.1
Week of 8/25100.0*Average seed
West Auckland 2 Botany 7 +0.2
Week of 8/28None
Points
Chance Will Make Playoffs