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
Newcastle 0 Brisbane 5 -4.7
+0.1
Newcastle 1 Melbourne 0 +3.1
-0.1
Adelaide 1 Central Coast 1 +2.8
+0.1
Brisbane 2 Sydney 1 -0.2
+0.1
Week of 1/27100.0*Chance in playoffs100.0*Average seed
Central Coast 3 Melbourne 1 +24.5
+0.9
Perth 1 Sydney 2 In
-0.2
Week of 2/3100.0*Chance in playoffs100.0*Average seed
Newcastle 1 Perth 3 +0.4
Sydney 2 Adelaide 1 -0.3
Brisbane 2 Central Coast 2 -0.1
Points
Chance Will Make Playoffs