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*Premier Division Playoff100.0*Average seed
Swindon 2 Tiverton Town 2 +0.2
-0.0
Evesham United 1 Mangotsfield 0 -0.0
-0.0
Salisbury 7 Wantage Town 0 -0.1
Week of 4/15100.0*Premier Division Playoff100.0*Average seed
Barnstaple Town 0 Tiverton Town 4 +0.2
Tiverton Town 1 Winchester City 0 +0.2
Mangotsfield 1 Salisbury 3 -0.2
Salisbury 5 Wimborne Town 2 -0.1
Bideford 1 Evesham United 1 +0.0
Evesham United 0 Hereford FC 2 +0.0
Bridgwater Town 1 Taunton Town 5 -0.0
Week of 4/22100.0*Premier Division Playoff100.0*Average seed
Bideford 0 Salisbury 1 -0.3
Tiverton Town 3 Paulton Rovers 1 +0.2
Points
Chance Will Win Championship