How are these numbers calculated?

Big Games

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

Week of 4/27100.0*Down to Championship100.0*Average seed
Sunderland 4 Cardiff 0 +21.4
-0.8
Week of 5/3100.0*Down to Championship100.0*Average seed
Newcastle 3 Cardiff 0 +6.2
-0.5
Man United 0 Sunderland 1 +3.2
-0.1
Stoke 4 Fulham 1 -1.4
+0.2
Aston Villa 3 Hull 1 +0.9
Week of 5/11100.0*Down to Championship100.0*Average seed
Cardiff 1 Chelsea 2 -0.4
Norwich 0 Arsenal 2 +0.2
Fulham 2 Crystal Palace 2 +0.1
Points
Chance Will Win Championship