How are these numbers calculated?

Big Games

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

Week of 4/25100.0*Average seed
Aldershot 2 Chester 2 -0.2
Macclesfield 2 Barnet 1 +0.2
Accrington 1 Chesterfield 0 -0.1
Week of 5/2100.0*Average seed
Lincoln City 0 Aldershot 2 +0.5
Barnet 1 Port Vale 2 +0.3
Bury 1 Accrington 0 +0.2
Points
Chance Will Win Championship