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
Hereford 2 Rochdale 1 +1.2
Accrington 1 Barnet 0 -0.2
Crewe 5 Accrington 1 -0.1
Burton 0 Bournemouth 2 +0.1
Chesterfield 1 Bradford 1 -0.0
Torquay 1 Macclesfield 0 -0.0
Week of 5/8100.0*Average seed
Hereford 3 Rotherham 0 +0.9
Crewe 0 Bradford 1 +0.4
Lincoln City 0 Macclesfield 0 +0.1
Torquay 0 Notts County 0 -0.1
Points
Chance Will Win Championship