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*Average seed
Sydney 1 Wellington 0 -21.0
-0.5
Central Coast 3 Brisbane 4 +5.8
Adelaide 2 Newcastle 0 -0.3
Week of 1/16100.0*Chance in playoffs100.0*Average seed
Melbourne 3 Central Coast 0 +11.0
+0.1
Wellington 1 Adelaide 1 -8.2
+0.1
Brisbane 3 Sydney 1 +1.5
+0.2
Newcastle 2 Perth 1 +1.5
+0.2
Week of 1/23100.0*Chance in playoffs100.0*Average seed
Melbourne 2 Wellington 0 Out
-0.2
Points
Chance Will Make Playoffs