How are these numbers calculated?

Big Games

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

Week of 7/1100.0*Average seed
Hemel 25 South Wales 18 +0.2
Week of 7/8100.0*Average seed
York 68 Hemel 6 -0.1
South Wales 12 Doncaster 70 +0.0
Week of 7/15100.0*Average seed
Toronto 74 Hemel 16 -0.0
London 36 South Wales 16 +0.0
Games Above .500
Chance Will Win Championship