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
Kidlington 0 Salisbury 1 +1.0
+0.2
Evesham United 2 Bishop's Cleeve 1 -0.3
Bristol Manor F 5 Barnstaple Town 1 -0.2
-0.1
Bideford 2 Paulton Rovers 1 -0.2
Didcot Town 0 Totton 0 +0.1
Swindon Superma 2 Salisbury 2 +0.1
+0.0
North Leigh 1 Cirencester Town 2 -0.1
Swindon Superma 1 Winchester City 1 +0.1
+0.0
Wimborne Town 1 Taunton Town 1 +0.0
Larkhall Athletic 2 Bristol Manor F 0 +0.1
Week of 4/21100.0*Chance in playoffs100.0*Average seed
Salisbury 2 Didcot Town 1 In
+0.1
Taunton Town 2 Bristol Manor F 1 +0.0
Totton 1 Wimborne Town 1 +0.0
Week of 4/28None
Points
Chance Will Make Playoffs