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 1 Melbourne 0 -12.8
-0.6
Newcastle 0 Brisbane 5 -2.0
-0.3
Adelaide 1 Central Coast 1 -0.4
-0.0
Brisbane 2 Sydney 1 -0.2
-0.1
Week of 1/27100.0*Chance in playoffs100.0*Average seed
Central Coast 3 Melbourne 1 Out
-0.4
Week of 2/3None
Points
Chance Will Make Playoffs