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 -1.3
-0.2
Chesterfield 1 Bradford 1 -1.3
-0.2
Port Vale 2 Notts County 1 -1.1
-0.2
Lincoln City 1 Bury 0 +0.8
+0.1
Morecambe 1 Dag & Red 0 +0.3
Barnet 0 Rotherham 1 -0.1
-0.1
Northampton 2 Shrewsbury 0 -0.0
Week of 5/8100.0*Promoted100.0*Average seed
Chesterfield 2 Bournemouth 1 +4.5
+1.2
Morecambe 1 Aldershot 0 -1.3
-0.1
Darlington 0 Dag & Red 2 -1.3
-0.1
Northampton 1 Bury 1 +1.1
+0.4
Port Vale 1 Shrewsbury 1 +0.8
-0.0
Points
Chance Will Win Championship