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
Perth 3 Melbourne 2 -0.6
-0.4
Sydney 1 Wellington 0 In
Adelaide 2 Newcastle 0 -0.1
-0.1
Adelaide 0 Brisbane 0 +0.1
Week of 1/16100.0*Chance in playoffs100.0*Average seed
Melbourne 3 Central Coast 0 +0.4
Wellington 1 Adelaide 1 +0.2
Brisbane 3 Sydney 1 -0.1
Week of 1/23100.0*Chance in playoffs100.0*Average seed
Melbourne 2 Wellington 0 +0.4
Points
Chance Will Make Playoffs