How are these numbers calculated?

Big Games

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

Week of 7/29100.0*Chance in playoffs100.0*Average seed
Canterbury 18 Illawarra 12 +11.4
+0.9
Parramatta 22 Brisbane 14 +1.0
+0.1
Cronulla 32 Canberra 10 +0.8
-0.1
Newcastle 12 Penrith 23 -0.6
-0.2
Manly 8 Balmain 4 -0.1
-0.0
Week of 8/5100.0*Chance in playoffs100.0*Average seed
St George 0 Canterbury 26 In
+0.7
Illawarra 14 Cronulla 22 -0.2
Balmain 16 Penrith 14 +0.2
Wests 23 Manly 20 +0.1
Week of 8/12100.0*Chance in playoffs100.0*Average seed
Canterbury 14 Souths 18 -0.5
Penrith 4 Manly 18 +0.5
Cronulla 16 St George 14 -0.3
Games Above .500
Chance Will Make Playoffs