How are these numbers calculated?

Big Games

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

Week of 4/13100.0*Average seed
Stevenage 0 Yeovil 2 -0.5
Shrewsbury 0 Bournemouth 3 +0.1
Carlisle 1 Preston 1 +0.1
Week of 4/20100.0*Average seed
Swindon 3 Stevenage 0 -0.2
Shrewsbury 1 Oldham 0 -0.1
Preston 1 Tranmere 0 -0.1
Colchester 0 Shrewsbury 0 +0.1
Bournemouth 3 Carlisle 1 +0.0
Week of 4/27100.0*Average seed
Shrewsbury 3 Portsmouth 2 -0.3
Carlisle 0 Colchester 2 +0.3
Stevenage 0 MK Dons 2 -0.3
Points
Chance Will Win Championship