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*Top 4100.0*Average seed
St Kilda 76 Sydney 146 +5.1
+0.0
Hawthorn 96 North Melbourne 57 -3.9
-0.1
-0.2
Port Adelaide 54 Melbourne 94 +0.3
Bulldogs 95 Collingwood 92 -0.0
-0.0
GWS 96 West Coast 97 -0.1
Week of 8/20100.0*Chance in playoffs100.0*Top 4100.0*Average seed
Carlton 78 Melbourne 58 +8.5
+0.1
North Melbourne 76 Sydney 85 -7.1
-0.1
Richmond 46 St Kilda 55 -0.4
Week of 8/26100.0*Chance in playoffs100.0*Top 4100.0*Average seed
North Melbourne 63 GWS 100 -0.7
St Kilda 161 Brisbane 103 -0.4
Games Above .500
Chance Will Make Playoffs