How are these numbers calculated?

Big Games

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

Week of 4/14100.0*Chance in playoffs100.0*Average seed
Yate Town 0 Totton 1 +1.2
+0.8
Didcot Town 0 Totton 0 -0.7
Bristol Manor F 5 Barnstaple Town 1 -0.2
-0.0
Larkhall Athletic 2 Bristol Manor F 0 +0.2
Shortwood United 0 Evesham United 4 -0.2
-0.0
Kidlington 1 Bideford 2 -0.2
-0.1
Swindon Superma 1 Winchester City 1 +0.2
Evesham United 2 Bishop's Cleeve 1 -0.1
-0.0
Shortwood United 0 Wimborne Town 5 -0.1
Bideford 2 Paulton Rovers 1 -0.1
-0.1
North Leigh 1 Cirencester Town 2 -0.1
-0.1
Bideford 2 North Leigh 0 -0.1
-0.1
Winchester City 0 Taunton Town 5 +0.1
Kidlington 0 Salisbury 1 +0.1
Yate Town 1 Slimbridge 1 +0.0
Week of 4/21100.0*Chance in playoffs100.0*Average seed
Totton 1 Wimborne Town 1 -0.8
-0.3
Mangotsfield Un 0 Evesham United 2 -0.6
-0.1
Slimbridge 4 Bideford 3 +0.4
+0.1
Bishop's Cleeve 0 Swindon Superma 5 -0.3
-0.0
Taunton Town 2 Bristol Manor F 1 +0.2
Salisbury 2 Didcot Town 1 +0.2
+0.1
Cirencester Town 3 Kidlington 2 -0.1
-0.2
Cinderford Town 3 Bideford 4 -0.1
North Leigh 0 Didcot Town 2 -0.1
Didcot Town 4 Larkhall Athletic 2 -0.1
Salisbury 1 Bideford 0 +0.1
Winchester City 1 Cirencester Town 2 -0.1
Week of 4/28100.0*Chance in playoffs100.0*Average seed
Evesham United 1 Totton 0 -0.1
Bristol Manor F 2 Salisbury 3 +0.1
Bideford 2 Winchester City 0 -0.0
Points
Chance Will Make Playoffs