How are these numbers calculated?

Big Games

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

Week of 1/9100.0*Chance in playoffs100.0*Average seed
Central Coast 3 Brisbane 4 -17.0
-0.7
Sydney 1 Wellington 0 +13.3
+0.2
Adelaide 2 Newcastle 0 -0.9
-0.1
Perth 3 Melbourne 2 +0.4
+0.1
Adelaide 0 Brisbane 0 -0.3
+0.0
Week of 1/16100.0*Chance in playoffs100.0*Average seed
Melbourne 3 Central Coast 0 -17.5
-0.5
Wellington 1 Adelaide 1 +11.5
+0.1
Brisbane 3 Sydney 1 +2.5
-0.0
Newcastle 2 Perth 1 -1.6
Week of 1/23100.0*Chance in playoffs100.0*Average seed
Melbourne 2 Wellington 0 In
+0.2
Points
Chance Will Make Playoffs