How are these numbers calculated?

Big Games

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

Week of 4/8100.0*Average seed
Slimbridge 2 Bideford 0 +0.1
Paulton Rovers 3 Shortwood United 1 -0.0
Bishop's Cleeve 3 Bridgwater Town 0 -0.0
Didcot Town 1 Hereford FC 2 +0.0
Winchester City 0 Larkhall Athletic 0 +0.0
Week of 4/15100.0*Average seed
Larkhall Athletic 0 Didcot Town 1 -0.9
Winchester City 0 AFC Totton 1 +0.2
Yate Town 2 Larkhall Athletic 2 -0.1
Shortwood United 1 Swindon 0 -0.1
Paulton Rovers 1 Bridgwater Town 0 -0.1
Wimborne Town 0 Yate Town 3 +0.1
AFC Totton 4 Bishop's Cleeve 0 +0.1
North Leigh 1 Paulton Rovers 0 +0.1
Didcot Town 1 North Leigh 1 +0.1
Tiverton Town 1 Winchester City 0 +0.1
Bishop's Cleeve 2 Mangotsfield 2 +0.0
Barnstaple Town 0 Tiverton Town 4 +0.0
Bideford 1 Evesham United 1 -0.0
Week of 4/22100.0*Average seed
Larkhall Athletic 3 Swindon 1 +0.9
Mangotsfield 2 Didcot Town 3 -0.3
Tiverton Town 3 Paulton Rovers 1 +0.2
Hereford FC 4 Winchester City 0 +0.1
Points
Chance Will Win Championship