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 +12.3
+0.6
Adelaide 0 Brisbane 0 +1.3
-0.1
Sydney 1 Wellington 0 +1.2
Perth 3 Melbourne 2 +0.1
Adelaide 2 Newcastle 0 -0.1
Week of 1/16100.0*Chance in playoffs100.0*Average seed
Melbourne 3 Central Coast 0 +0.2
Brisbane 3 Sydney 1 In
+0.2
Wellington 1 Adelaide 1 +0.0
Week of 1/23100.0*Chance in playoffs100.0*Average seed
Central Coast 0 Adelaide 1 -0.3
Brisbane 4 Perth 2 +0.2
Melbourne 2 Wellington 0 -0.2
Points
Chance Will Make Playoffs