How are these numbers calculated?

Big Games

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

Week of 4/19100.0*Promoted100.0*Average seed
Stranraer 1 Brechin 2 -2.8
-0.3
Stenhousemuir 0 Rangers 4 +0.6
+0.1
Rangers 2 Ayr Utd 1 +0.3
+0.1
Forfar Athletic 0 Arbroath 2 +0.3
Ayr Utd 1 Dunfermline 1 +0.1
+0.0
Week of 4/26100.0*Promoted100.0*Average seed
Stenhousemuir 1 Airdrieonians 2 +2.2
+0.1
Forfar Athletic 4 Ayr Utd 2 +1.0
+0.2
Rangers 3 Stranraer 0 -0.9
-0.1
Week of 5/3100.0*Promoted100.0*Average seed
Brechin 1 Stenhousemuir 3 -1.0
-0.1
Stranraer 3 Forfar Athletic 1 +0.6
+0.3
Ayr Utd 4 East Fife 1 -0.5
-0.2
Points
Chance Will Win Championship