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
Colney Heath 0 Oxhey Jets 0 -7.9
-0.1
Oxhey Jets 2 Biggleswade Utd 0 +7.2
+0.1
London Tigers 2 Aylesbury Utd 6 -7.0
-0.1
Oxhey Jets 10 Hatfield Town 1 +5.4
+0.1
Week of 4/20100.0*Chance in playoffs100.0*Average seed
Haringey Boro 1 Oxhey Jets 0 -37.7
-0.4
Ampthill Town 3 Oxhey Jets 2 -21.8
-0.2
Oxhey Jets 3 Hanwell Town 1 +17.1
+0.2
Aylesbury Utd 3 London Colney 1 -12.0
-0.1
Week of 4/27100.0*Chance in playoffs100.0*Average seed
Hertford Town 3 Aylesbury Utd 1 +55.2
+0.6
Oxhey Jets 0 Hadley 1 Out
-0.1
Points
Chance Will Make Playoffs