How are these numbers calculated?

Big Games

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

Week of 4/13100.0*Average seed
Larkhall Athletic 1 Highworth Town 0 +0.5
Paulton Rovers 0 Thatcham Town 1 -0.2
Winchester City 1 Bristol Manor F 3 -0.1
Totton 4 Bideford 0 +0.1
Fleet Town 0 Melksham Town 3 -0.0
Week of 4/20100.0*Average seed
Thatcham Town 3 Larkhall Athletic 1 -0.6
Larkhall Athletic 2 Bristol Manor F 0 +0.3
Bideford 2 Slimbridge 0 -0.1
Paulton Rovers 1 Bideford 2 -0.1
Street 1 Totton 0 -0.1
Highworth Town 1 Barnstaple Town 1 +0.1
Bristol Manor F 4 Fleet Town 1 -0.0
Week of 4/27100.0*Average seed
Moneyfields 0 Larkhall Athletic 1 +0.3
Bideford 3 Evesham United 1 -0.0
Points
Chance Will Make Playoffs