How are these numbers calculated?

Big Games

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

Week of 4/13100.0*Average seed
London Colney 4 Hadley 2 +0.3
Ampthill Town 3 Leverstock Grn 0 -0.2
St.Margaretsbry 1 Ampthill Town 4 -0.2
Week of 4/20100.0*Average seed
Aylesbury Utd 3 London Colney 1 -0.2
Ampthill Town 3 Oxhey Jets 2 -0.2
Ampthill Town 3 Hertford Town 1 -0.0
Week of 4/27None
Points
Chance Will Make Playoffs