How are these numbers calculated?

Big Games

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

Week of 1/20100.0*Chance in playoffs100.0*Average seed
Brisbane 2 Sydney 1 -5.2
-0.5
Newcastle 0 Brisbane 5 +0.3
+0.2
Adelaide 1 Central Coast 1 -0.3
Newcastle 1 Melbourne 0 -0.2
Week of 1/27100.0*Chance in playoffs100.0*Average seed
Perth 1 Sydney 2 In
+0.7
Central Coast 3 Melbourne 1 -3.1
-0.2
Week of 2/3100.0*Chance in playoffs100.0*Average seed
Sydney 2 Adelaide 1 +0.6
Points
Chance Will Make Playoffs