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
Richmond 78 Geelong 82 -0.2
Brisbane 99 Carlton 95 +0.2
Essendon 75 Gold Coast 69 +0.1
Bulldogs 95 Collingwood 92 +0.1
Week of 8/20100.0*Average seed
Carlton 78 Melbourne 58 -0.3
Richmond 46 St Kilda 55 -0.2
Collingwood 118 Gold Coast 47 -0.2
Week of 8/26100.0*Average seed
Essendon 103 Carlton 79 +0.3
Games Above .500
Chance Will Make Playoffs