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 Out
-0.2
Points
Chance Will Make Playoffs