How are these numbers calculated?

Big Games

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

Week of 4/20100.0*Average seed
Whitby Town 1 Eastwood Town 1 -0.4
Stocksbridge 5 Nantwich Town 2 +0.2
Ilkeston FC 0 Hednesford Town 2 +0.1
Nantwich Town 3 Frickley 2 -0.1
FC United 3 Ashton United 0 +0.1
Marine 1 North Ferriby 3 +0.0
Week of 4/27100.0*Average seed
Blyth Spartans 1 Kendal Town 3 +0.2
Ashton United 2 Whitby Town 2 -0.2
Buxton 3 Nantwich Town 1 +0.1
Eastwood Town 1 Blyth Spartans 4 -0.1
Matlock Town 1 Ilkeston FC 1 +0.1
Week of 5/4100.0*Average seed
Stafford 0 Whitby Town 1 +0.8
Ilkeston FC 1 Marine 0 -0.2
Nantwich Town 2 Blyth Spartans 1 +0.0
Points
Chance Will Win Championship