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*Chance in playoffs100.0*Average seed
Oxhey Jets 2 Biggleswade Utd 0 -15.7
-0.2
Oxhey Jets 10 Hatfield Town 1 -14.1
-0.1
London Tigers 2 Aylesbury Utd 6 +13.9
+0.1
Colney Heath 0 Oxhey Jets 0 +2.0
+0.0
Week of 4/20100.0*Chance in playoffs100.0*Average seed
Haringey Boro 1 Oxhey Jets 0 +22.4
+0.2
Oxhey Jets 3 Hanwell Town 1 -18.5
-0.2
Aylesbury Utd 3 London Colney 1 +18.3
+0.2
Ampthill Town 3 Oxhey Jets 2 +16.6
+0.2
Week of 4/27100.0*Chance in playoffs100.0*Average seed
Hertford Town 3 Aylesbury Utd 1 -24.3
-0.2
Oxhey Jets 0 Hadley 1 In
+0.2
Points
Chance Will Make Playoffs