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 +0.2
Stotfold 2 St.Margaretsbry 3 -0.1
Leverstock Grn 0 Harefield Utd 2 +0.1
Hillingdon Boro 1 Colney Heath 5 -0.1
Week of 4/20100.0*Average seed
Hadley 4 Stotfold 2 -0.1
Week of 4/27None
Points
Chance Will Make Playoffs