How are these numbers calculated?

Big Games

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

Week of 4/24100.0*Promoted100.0*Average seed
Cheltenham 1 Aldershot 2 +6.8
+1.3
Port Vale 2 Notts County 1 -1.2
-0.2
Lincoln City 1 Bury 0 +0.7
+0.2
Chesterfield 1 Bradford 1 +0.7
+0.1
Barnet 0 Rotherham 1 -0.4
-0.1
Northampton 2 Shrewsbury 0 -0.2
-0.0
Week of 5/8100.0*Promoted100.0*Average seed
Morecambe 1 Aldershot 0 -0.8
Hereford 3 Rotherham 0 +0.2
Darlington 0 Dag & Red 2 -0.1
Points
Chance Will Win Championship