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
Yate Town 3 North Leigh 2 -2.3
-0.4
Evesham United 1 Mangotsfield 0 -1.3
+0.1
Swindon 2 Tiverton Town 2 +0.2
+0.0
North Leigh 2 Yate Town 1 +0.1
+0.2
Week of 4/15100.0*Premier Division Playoff100.0*Average seed
Evesham United 0 Hereford FC 2 +0.2
North Leigh 1 Paulton Rovers 0 +0.1
+0.3
Didcot Town 1 North Leigh 1 No
-0.1
Bideford 1 Evesham United 1 -0.1
Shortwood United 1 Swindon 0 +0.2
Mangotsfield 1 Salisbury 3 +0.1
Swindon 5 Wantage Town 0 -0.1
Bishop's Cleeve 2 Mangotsfield 2 +0.1
Week of 4/22100.0*Premier Division Playoff100.0*Average seed
North Leigh 1 Taunton Town 0 +0.6
Larkhall Athletic 3 Swindon 1 +0.3
Mangotsfield 2 Didcot Town 3 +0.2
Points
Chance Will Win Championship