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*UEFA CL100.0*Average seed
West Ham 3 Manchester United 2 +11.8
+0.1
Norwich City 0 Manchester United 1 -11.7
-0.2
West Ham 1 Swansea City 4 +6.2
+0.1
Manchester City 2 Arsenal 2 -5.2
-0.2
Liverpool 1 Chelsea 1 +0.3
Liverpool 2 Watford 0 -0.3
Week of 5/15100.0*UEFA CL100.0*Average seed
Manchester United 3 Bournemouth 1 -20.9
-0.2
Swansea City 1 Manchester City 1 +14.6
+0.0
Stoke City 2 West Ham 1 +2.0
+0.0
Arsenal 4 Aston Villa 0 -0.1
Points
Chance Will Win Championship