How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 4/20100.0*Chance wins title100.0*Promoted100.0*Average seed
Ilkeston FC 0 Hednesford Town 2 -16.5
-12.4
-0.2
Marine 1 North Ferriby 3 +15.7
+11.7
+0.2
Week of 4/27100.0*Chance wins title100.0*Promoted100.0*Average seed
North Ferriby 1 Chorley 0 +18.4
+13.8
+0.2
Hednesford Town 4 Stocksbridge 1 -11.0
-8.2
-0.1
Week of 5/4100.0*Chance wins title100.0*Promoted100.0*Average seed
AFC Fylde 1 Hednesford Town 2 -25.9
-19.5
-0.3
North Ferriby 2 Ashton United 0 +20.0
+15.0
+0.2
Points  (Full Screen)
Chance Will Win Championship  (Full Screen)