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*Relegated100.0*Average seed
Forfar Athletic 0 Arbroath 2 +12.7
-0.2
Airdrieonians 2 East Fife 1 +7.6
-0.2
Stranraer 1 Brechin 2 +1.0
-0.1
Week of 4/26100.0*Relegated100.0*Average seed
Arbroath 1 Dunfermline 2 -14.6
+0.2
East Fife 1 Brechin 2 +12.6
-0.2
Week of 5/3100.0*Relegated100.0*Average seed
Airdrieonians 2 Arbroath 0 -30.0
+0.4
Ayr Utd 4 East Fife 1 +14.4
-0.2
Points
Chance Will Win Championship