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*Average seed
Mansfield 0 Rotherham 1 +0.3
Macclesfield 1 Chesterfield 0 +0.2
Week of 5/3100.0*Average seed
Chesterfield 1 Notts County 1 +0.1
Rotherham 1 Barnet 0 +0.1
Points
Chance Will Win Championship