How are these numbers calculated?

Big Games

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

Week of 1/9100.0*Chance in playoffs100.0*Relegated100.0*Average seed
Central Coast 3 Brisbane 4 -0.2
Perth 3 Melbourne 2 No
+0.4
Adelaide 2 Newcastle 0 -5.5
+0.1
Sydney 1 Wellington 0 +0.8
-0.2
Week of 1/16100.0*Chance in playoffs100.0*Relegated100.0*Average seed
Newcastle 2 Perth 1 Out
-0.5
Wellington 1 Adelaide 1 Out
-0.1
Brisbane 3 Sydney 1 +0.2
Week of 1/23100.0*Chance in playoffs100.0*Relegated100.0*Average seed
Brisbane 4 Perth 2 -0.2
Points
Chance Will Make Playoffs