How are these numbers calculated?

Big Games

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

Week of 1/5100.0*Chance in playoffs100.0*Average seed
Newcastle 1 Central Coast 0 -5.3
-0.1
Central Coast 0 New Zealand 0 +2.5
+0.1
Perth 2 Melbourne 2 +0.0
Week of 1/12100.0*Chance in playoffs100.0*Average seed
Melbourne 1 Brisbane 2 +41.4
+0.8
Perth 3 Newcastle 3 +13.5
+0.2
Adelaide 1 Sydney 0 -8.6
-0.2
Week of 1/19100.0*Chance in playoffs100.0*Average seed
Newcastle 4 Melbourne 0 -43.3
-0.4
Brisbane 1 Sydney 1 Out
-0.5
Points
Chance Will Make Playoffs