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 1 Melbourne 0 -3.4
+0.1
Newcastle 0 Brisbane 5 -2.2
-0.2
Brisbane 2 Sydney 1 +0.9
-0.1
Adelaide 1 Central Coast 1 -0.9
-0.0
Week of 1/27100.0*Chance in playoffs100.0*Average seed
Perth 1 Sydney 2 Out
-0.5
Central Coast 3 Melbourne 1 -2.2
+0.0
Week of 2/3100.0*Chance in playoffs100.0*Average seed
Newcastle 1 Perth 3 +0.7
Brisbane 2 Central Coast 2 +0.1
Points
Chance Will Make Playoffs