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
Hillingdon Boro 4 Tring Athletic 0 +0.7
Hillingdon Boro 1 Colney Heath 5 -0.6
London Tigers 2 Aylesbury Utd 6 +0.2
Oxhey Jets 2 Biggleswade Utd 0 +0.1
Biggleswade Utd 1 Hanwell Town 2 +0.1
Holmer Green 0 Hertford Town 5 -0.1
Ampthill Town 3 Leverstock Grn 0 +0.1
Berkhamsted 2 Hertford Town 2 +0.0
Week of 4/20100.0*Average seed
Hillingdon Boro 0 Holmer Green 1 -0.7
Hatfield Town 1 Biggleswade Utd 4 -0.2
Hertford Town 0 AFC Dunstable 1 +0.2
Ampthill Town 3 Hertford Town 1 +0.2
Colney Heath 2 Tring Athletic 3 -0.1
Hertford Town 1 London Tigers 0 -0.0
Week of 4/27100.0*Average seed
Hertford Town 3 Aylesbury Utd 1 -0.3
London Tigers 1 Berkhamsted 4 +0.2
Biggleswade Utd 1 Haringey Boro 1 +0.1
London Colney 2 Hillingdon Boro 2 -0.1
Points
Chance Will Make Playoffs