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
Ilkeston FC 0 Hednesford Town 2 -0.4
Stocksbridge 5 Nantwich Town 2 +0.2
Nantwich Town 3 Frickley 2 -0.1
Whitby Town 1 Eastwood Town 1 +0.1
Marine 1 North Ferriby 3 +0.0
Week of 4/27100.0*Average seed
Matlock Town 1 Ilkeston FC 1 -0.3
Ashton United 2 Whitby Town 2 +0.1
Blyth Spartans 1 Kendal Town 3 +0.1
Grantham Town 1 Marine 0 +0.1
Stafford 2 Nantwich Town 0 +0.1
Buxton 3 Nantwich Town 1 +0.0
Week of 5/4100.0*Average seed
Stafford 0 Whitby Town 1 -0.4
Ilkeston FC 1 Marine 0 +0.2
Points
Chance Will Win Championship