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
Leeds 12 St Helens 13 +0.4
Widnes 24 Wigan 10 +0.1
Week of 9/5100.0*Average seed
Castleford 26 Wakefield 22 -0.1
Week of 9/12100.0*Average seed
Catalan 28 Castleford 6 +0.6
Huddersfield 17 St Helens 16 -0.3
Games Above .500
Chance Will Make Playoffs