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 1 Swansea City 4 -8.1
-0.5
West Ham 3 Manchester United 2 +3.5
+0.7
Norwich City 0 Manchester United 1 -1.4
-0.2
Manchester City 2 Arsenal 2 -0.4
Tottenham Hotspur 1 Southampton 2 -0.2
Liverpool 2 Watford 0 -0.1
Liverpool 1 Chelsea 1 +0.0
Week of 5/15100.0*UEFA CL100.0*Average seed
Manchester United 3 Bournemouth 1 No
-0.3
Stoke City 2 West Ham 1 No
-0.7
Swansea City 1 Manchester City 1 No
-0.0
Southampton 4 Crystal Palace 1 -0.4
West Brom 1 Liverpool 1 +0.1
Points
Chance Will Win Championship