How are these numbers calculated?

Big Games

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

Week of 1/29100.0*Chance in playoffs100.0*Relegated100.0*Average seed
Perth 3 Central Coast 1 Out
+2.0
-0.4
Wellington 1 Adelaide 0 -5.0
-3.1
Brisbane 1 Sydney 0 -2.8
+0.9
-0.2
North Queenslan 2 Newcastle 1 +2.2
-0.3
Week of 2/5100.0*Chance in playoffs100.0*Relegated100.0*Average seed
Central Coast 3 Newcastle 0 No
+0.7
Adelaide 2 Brisbane 0 +10.3
Melbourne 2 North Queenslan 0 -0.1
+0.1
Week of 2/12100.0*Chance in playoffs100.0*Relegated100.0*Average seed
Wellington 3 Central Coast 0 -0.4
Points
Chance Will Make Playoffs