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
Evesham United 1 Mangotsfield 0 +9.3
+0.2
Swindon 2 Tiverton Town 2 +2.8
Yate Town 3 North Leigh 2 +1.6
North Leigh 2 Yate Town 1 -0.1
Salisbury 7 Wantage Town 0 -0.0
Week of 4/15100.0*Premier Division Playoff100.0*Average seed
Shortwood United 1 Swindon 0 +1.4
Mangotsfield 1 Salisbury 3 +0.4
-0.0
Bideford 1 Evesham United 1 +0.2
-0.1
Evesham United 0 Hereford FC 2 -0.2
-0.0
North Leigh 1 Paulton Rovers 0 -0.1
Didcot Town 1 North Leigh 1 Yes
Tiverton Town 1 Winchester City 0 -0.1
Barnstaple Town 0 Tiverton Town 4 -0.0
Week of 4/22None
Points
Chance Will Win Championship