How are these numbers calculated?

Big Games

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

Week of 4/30100.0*Average seed
Cardiff 4 Spurs 0 +0.3
Lewes 0 Coventry Utd 1 -0.1
Week of 5/7100.0*Average seed
Cardiff 1 Coventry Utd 2 -0.7
Week of 5/14100.0*Average seed
Crystal Palace 0 Cardiff 1 +0.3
C & K Basildon 4 Charlton 3 +0.3
Points
Chance Will Win Championship