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
Stotfold 3 Colney Heath 1 -0.7
Hillingdon Boro 1 Colney Heath 5 +0.6
Leverstock Grn 0 Harefield Utd 2 -0.1
Colney Heath 0 Oxhey Jets 0 +0.1
London Colney 4 Hadley 2 +0.1
Holmer Green 2 Haringey Boro 7 -0.1
Berkhamsted 2 Hertford Town 2 +0.1
Dunstable Town 1 AFC Dunstable 0 +0.0
Stotfold 2 St.Margaretsbry 3 +0.0
Week of 4/20100.0*Average seed
Colney Heath 2 Tring Athletic 3 -0.9
Colney Heath 4 Hatfield Town 1 +0.3
Leverstock Grn 4 Hadley 2 +0.3
Hanwell Town 0 Harefield Utd 1 -0.2
Berkhamsted 2 St.Margaretsbry 4 +0.2
Hadley 4 Stotfold 2 -0.1
AFC Dunstable 6 Leverstock Grn 2 -0.1
Haringey Boro 1 Oxhey Jets 0 -0.1
Haringey Boro 3 Dunstable Town 3 -0.0
Hertford Town 0 AFC Dunstable 1 -0.0
Week of 4/27100.0*Average seed
Harefield Utd 4 Colney Heath 1 -0.5
Oxhey Jets 0 Hadley 1 -0.4
London Tigers 1 Berkhamsted 4 -0.2
Points
Chance Will Make Playoffs