How are these numbers calculated?

Big Games

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

Week of 4/18100.0*Chance wins title100.0*Promoted100.0*Average seed
Peterhead 1 Forfar Athletic 0 +0.1
-0.2
Brechin 3 Dunfermline 0 +0.1
+1.6
+0.2
Stranraer 3 Stenhousemuir 2 -0.0
-0.0
Stirling Albion 0 Morton 2 -0.0
-0.0
Airdrieonians 2 Ayr Utd 0 -0.9
Week of 4/25100.0*Chance wins title100.0*Promoted100.0*Average seed
Peterhead 0 Airdrieonians 1 -0.6
Stenhousemuir 2 Brechin 2 +0.4
-0.1
Stranraer 0 Morton 2 +0.0
Week of 5/2None
Points
Chance Will Win Championship