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*Chance in playoffs100.0*Average seed
St Kilda 76 Sydney 146 -5.7
-0.2
Hawthorn 96 North Melbourne 57 +3.2
+0.0
GWS 96 West Coast 97 -0.2
Week of 8/20100.0*Chance in playoffs100.0*Average seed
North Melbourne 76 Sydney 85 +0.8
Richmond 46 St Kilda 55 +0.4
+0.5
Carlton 78 Melbourne 58 +0.2
+0.5
Port Adelaide 94 Adelaide 109 +0.2
Week of 8/26100.0*Chance in playoffs100.0*Average seed
North Melbourne 63 GWS 100 +0.7
St Kilda 161 Brisbane 103 +0.4
+0.1
Games Above .500
Chance Will Make Playoffs