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*Promoted100.0*Average seed
Scunthorpe 3 Cheltenham 0 -1.7
-0.1
Tranmere 1 Yeovil 1 -0.7
-0.0
Week of 5/2100.0*Promoted100.0*Average seed
Scunthorpe 1 Tranmere 1 No
-0.2
Peterborough 2 Swindon 2 +0.1
Southend 2 Cheltenham 0 +0.1
Points
Chance Will Win Championship