How are these numbers calculated?

Big Games

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

Week of 8/29100.0*Chance in playoffs100.0*Average seed
Widnes 24 Wigan 10 +16.9
+0.5
Hull FC 28 Hull KR 0 +6.5
+0.1
Catalan 46 London 4 -2.0
-0.2
Wakefield 42 Salford 6 +1.4
+0.0
Week of 9/5100.0*Chance in playoffs100.0*Average seed
Bradford 12 Widnes 32 In
+0.3
Castleford 26 Wakefield 22 +5.2
+0.1
Hull KR 14 Catalan 32 +4.9
-0.1
Week of 9/12100.0*Chance in playoffs100.0*Average seed
Salford 36 Widnes 6 -0.3
Catalan 28 Castleford 6 -0.1
Games Above .500
Chance Will Make Playoffs