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
Central Coast 3 Brisbane 4 +15.5
+0.7
Sydney 1 Wellington 0 +2.6
+0.0
Adelaide 0 Brisbane 0 +1.5
-0.2
Adelaide 2 Newcastle 0 -0.4
-0.1
Perth 3 Melbourne 2 +0.1
Week of 1/16100.0*Chance in playoffs100.0*Average seed
Brisbane 3 Sydney 1 In
+0.3
Melbourne 3 Central Coast 0 +0.6
+0.0
Wellington 1 Adelaide 1 +0.0
Week of 1/23100.0*Chance in playoffs100.0*Average seed
Central Coast 0 Adelaide 1 -0.4
Brisbane 4 Perth 2 +0.2
Melbourne 2 Wellington 0 -0.2
Points
Chance Will Make Playoffs