How are these numbers calculated?

Big Games

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

Week of 5/7100.0*Average seed
West Ham 1 Swansea City 4 +1.1
Norwich City 4 Watford 2 +0.2
Sunderland 3 Everton 0 +0.2
Bournemouth 1 West Brom 1 +0.1
Crystal Palace 2 Stoke City 1 +0.1
Liverpool 1 Chelsea 1 -0.0
Liverpool 2 Watford 0 +0.0
Leicester City 3 Everton 1 +0.0
Week of 5/15100.0*Average seed
Swansea City 1 Manchester City 1 -0.4
Watford 2 Sunderland 2 +0.4
Everton 3 Norwich City 0 -0.3
Stoke City 2 West Ham 1 -0.2
Points
Chance Will Win Championship