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 -7.2
-0.1
Central Coast 0 New Zealand 0 +2.4
+0.1
Week of 1/12100.0*Chance in playoffs100.0*Average seed
Melbourne 1 Brisbane 2 +29.1
+0.6
Adelaide 1 Sydney 0 -9.3
-0.2
Perth 3 Newcastle 3 +6.7
+0.1
Week of 1/19100.0*Chance in playoffs100.0*Average seed
Brisbane 1 Sydney 1 Out
-0.6
Newcastle 4 Melbourne 0 -29.7
-0.3
Points
Chance Will Make Playoffs