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*Promoted100.0*Average seed
Buxton 2 Rushall Olympic 0 -2.7
-0.5
Witton Albion 3 Matlock Town 0 -1.3
-0.1
AFC Fylde 0 Stafford 1 +0.7
+0.1
FC United 1 Worksop Town 0 -0.6
AFC Fylde 3 Frickley 2 -0.5
-0.0
Stocksbridge 0 AFC Fylde 2 -0.4
FC United 3 Ashton United 0 -0.1
Chorley 1 Ashton United 1 +0.1
Week of 4/27100.0*Promoted100.0*Average seed
Rushall Olympic 0 FC United 1 No
-0.3
Frickley 0 Witton Albion 2 -0.5
AFC Fylde 1 Rushall Olympic 3 +0.3
Kendal Town 1 Buxton 0 +0.2
North Ferriby 1 Chorley 0 +0.1
Buxton 3 Nantwich Town 1 -0.1
Week of 5/4100.0*Promoted100.0*Average seed
Witton Albion 2 Rushall Olympic 0 -0.2
Worksop Town 2 Buxton 0 +0.2
Points
Chance Will Win Championship