How are these numbers calculated?

Big Games

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

Week of 8/9100.0*Chance in playoffs100.0*Average seed
CBR 4 Melb Mustangs 2 In
+0.4
CBR 2 Melb Mustangs 4 -1.3
-0.4
Syd Ice Dogs 2 Perth 8 +1.3
+0.1
Melb Ice 3 Adelaide 1 +1.3
-0.1
Syd Bears 0 Syd Ice Dogs 8 -0.7
Melb Ice 4 Adelaide 2 +0.1
-0.0
Melb Mustangs 1 Melb Ice 5 -0.0
Week of 8/16100.0*Chance in playoffs100.0*Average seed
Adelaide 5 CBR 2 -0.3
Adelaide 6 CBR 2 -0.3
Melb Mustangs 6 Newcastle 3 -0.2
Melb Ice 7 Newcastle 2 -0.2
Perth 3 Syd Ice Dogs 6 -0.1
Week of 8/23100.0*Chance in playoffs100.0*Average seed
Syd Bears 2 CBR 3 +0.2
Points
Chance Will Make Playoffs