How are these numbers calculated?

Big Games

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

Week of 4/23100.0*Average seed
Mansfield 1 Barnet 1 -0.5
Crawley 0 Carlisle 1 -0.2
Notts County 1 Cambridge 2 -0.2
Bristol Rovers 3 Exeter 1 +0.1
Luton 1 Newport 1 +0.1
Portsmouth 2 Wycombe 1 +0.1
Wimbledon 1 Leyton Orient 0 +0.1
Week of 4/30100.0*Average seed
Leyton Orient 1 Mansfield 0 -1.4
Wycombe 0 Accrington 1 +0.2
Carlisle 0 Oxford Utd 2 +0.2
Northampton 2 Luton 0 +0.1
Exeter 1 Morecambe 1 +0.1
Barnet 3 Yeovil 4 +0.1
Cambridge 2 Plymouth 2 -0.0
Week of 5/7100.0*Average seed
Notts County 0 Carlisle 5 -0.4
Mansfield 0 Cambridge 0 -0.3
Yeovil 0 Leyton Orient 1 -0.2
Oxford Utd 3 Wycombe 0 +0.2
Luton 4 Exeter 1 +0.0
Points
Chance Will Win Championship