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
Paulton Rovers 3 Shortwood United 1 -0.5
Didcot Town 2 Wimborne Town 0 +0.1
Slimbridge 2 Bideford 0 +0.1
Winchester City 0 Larkhall Athletic 0 +0.1
Week of 4/15100.0*Average seed
Shortwood United 1 Swindon 0 +0.8
Slimbridge 1 Shortwood United 2 +0.6
Tiverton Town 1 Winchester City 0 +0.2
Salisbury 5 Wimborne Town 2 +0.2
Wimborne Town 0 Yate Town 3 +0.2
Winchester City 0 AFC Totton 1 +0.1
Larkhall Athletic 0 Didcot Town 1 +0.1
North Leigh 1 Paulton Rovers 0 +0.1
Taunton Town 0 Bideford 0 +0.0
Week of 4/22100.0*Average seed
Bideford 0 Salisbury 1 +0.2
Shortwood United 1 Barnstaple Town 0 +0.2
Points
Chance Will Win Championship