How are these numbers calculated?

Big Games

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

Week of 5/16100.0*Average seed
Stoke City 2 Wigan 0 +1.0
Chelsea 2 Blackburn 0 +0.1
Bolton 1 Hull 1 +0.1
Portsmouth 3 Sunderland 1 -0.1
Week of 5/24100.0*Average seed
Arsenal 4 Stoke City 1 -0.4
Wigan 1 Portsmouth 0 -0.2
Man. City 1 Bolton 0 -0.1
Points
Chance Will Win Championship