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*Average seed
Widnes 24 Wigan 10 +0.2
Leeds 12 St Helens 13 +0.1
Castleford 32 Bradford 18 -0.1
Week of 9/5100.0*Average seed
Huddersfield 38 Hull FC 28 +0.3
Castleford 26 Wakefield 22 -0.1
Wigan 24 Warrington 20 -0.0
Week of 9/12100.0*Average seed
Huddersfield 17 St Helens 16 +0.7
Catalan 28 Castleford 6 +0.6
Games Above .500
Chance Will Make Playoffs