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 +0.9
Bolton 1 Hull 1 +0.2
Portsmouth 3 Sunderland 1 -0.0
Week of 5/24100.0*Average seed
Wigan 1 Portsmouth 0 -0.3
Arsenal 4 Stoke City 1 -0.2
Man. City 1 Bolton 0 -0.0
Points
Chance Will Win Championship