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
Lewes 0 Coventry Utd 1 +0.2
Cardiff 4 Spurs 0 -0.2
Week of 5/7100.0*Average seed
Cardiff 1 Coventry Utd 2 +0.5
Week of 5/14100.0*Average seed
Portsmouth 1 Coventry Utd 3 +0.0
Points
Chance Will Win Championship