How are these numbers calculated?

Big Games

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

Week of 4/26100.0*Promoted100.0*Average seed
Brentford 0 Hereford 3 -4.6
-0.1
Bury 1 Rochdale 1 -2.2
-0.0
Barnet 2 Stockport 1 +1.1
+0.2
Chester 0 Stockport 0 +0.2
Darlington 2 Dag & Red 3 +0.1
Notts County 1 Wycombe 0 +0.1
Week of 5/3100.0*Promoted100.0*Average seed
Stockport 1 Brentford 0 -0.3
Rochdale 1 Shrewsbury 1 -0.0
Points
Chance Will Win Championship