How are these numbers calculated?

Big Games

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

Week of 8/12100.0*Average seed
Bulldogs 95 Collingwood 92 -0.2
Richmond 78 Geelong 82 +0.1
Essendon 75 Gold Coast 69 +0.1
Brisbane 99 Carlton 95 +0.1
Week of 8/20100.0*Average seed
Richmond 46 St Kilda 55 +0.2
Collingwood 118 Gold Coast 47 +0.2
Week of 8/26None
Games Above .500
Chance Will Make Playoffs