How are these numbers calculated?

Big Games

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

Week of 4/25100.0*Promoted100.0*Average seed
Gillingham 0 Bury 0 -1.5
-0.3
Notts County 0 Dag & Red 3 -0.6
Shrewsbury 0 Lincoln City 0 +0.3
Darlington 1 Brentford 3 +0.3
+0.2
Exeter City 2 Morecambe 2 +0.3
Luton 1 Rochdale 1 +0.1
Week of 5/2100.0*Promoted100.0*Average seed
Rochdale 0 Gillingham 1 +0.5
Chester 1 Darlington 2 -0.2
Points
Chance Will Win Championship