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 +9.5
+0.7
Brisbane 2 Sydney 1 +3.5
+0.4
Adelaide 1 Central Coast 1 -0.6
Newcastle 1 Melbourne 0 -0.5
+0.1
Week of 1/27100.0*Chance in playoffs100.0*Average seed
Central Coast 3 Melbourne 1 Out
+0.0
Perth 1 Sydney 2 +0.2
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