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
Millwall 3 Carlisle 0 -17.3
-0.4
Doncaster 2 Luton 0 -12.4
-0.2
Hartlepool 0 Nottm Forest 1 -7.5
-0.2
Tranmere 1 Southend 0 +1.0
+0.1
Port Vale 2 Northampton 2 -0.2
Bristol Rovers 0 Brighton 2 -0.1
Week of 5/3100.0*Promoted100.0*Average seed
Carlisle 1 Bournemouth 1 -11.0
-0.2
Nottm Forest 3 Yeovil 2 -11.0
-0.3
Cheltenham 2 Doncaster 1 +6.6
+0.1
Points
Chance Will Win Championship