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*Average seed
Burton 0 Bournemouth 2 -0.7
Accrington 1 Barnet 0 -0.2
Hereford 2 Rochdale 1 -0.1
Torquay 1 Macclesfield 0 +0.1
Crewe 5 Accrington 1 +0.0
Week of 5/8100.0*Average seed
Crewe 0 Bradford 1 -0.5
Burton 3 Grimsby 0 +0.4
Port Vale 1 Shrewsbury 1 +0.1
Cheltenham 1 Accrington 1 +0.0
Torquay 0 Notts County 0 +0.0
Points
Chance Will Win Championship