How are these numbers calculated?

Big Games

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

Week of 4/22100.0*Chance wins title100.0*Promoted100.0*Average seed
Cowdenbeath 1 Arbroath 2 No
Edinburgh City 2 Annan Athletic 0 No
-2.4
-0.3
Forfar Athletic 3 Clyde 0 No
Berwick 0 Montrose 1 -1.5
-0.1
Elgin City 2 Stirling Albion 2 +0.5
+0.1
Week of 4/29100.0*Chance wins title100.0*Promoted100.0*Average seed
Annan Athletic 5 Montrose 1 +6.3
+0.7
Arbroath 3 Elgin City 2 +1.9
+0.2
Edinburgh City 1 Stirling Albion 0 +0.1
Week of 5/6None
Points
Chance Will Win Championship