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
Swindon Superma 1 Winchester City 1 -0.2
+0.0
Evesham United 2 Bishop's Cleeve 1 -0.1
-0.0
Winchester City 0 Taunton Town 5 Out
-0.4
Bideford 2 Paulton Rovers 1 -0.1
North Leigh 1 Cirencester Town 2 -0.1
Yate Town 0 Totton 1 -0.1
Kidlington 1 Swindon Superma 1 +0.0
Bideford 2 North Leigh 0 -0.0
Kidlington 0 Salisbury 1 +0.1
Yate Town 1 Slimbridge 1 +0.1
Week of 4/21100.0*Chance in playoffs100.0*Average seed
Winchester City 1 Cirencester Town 2 -0.1
Winchester City 2 North Leigh 0 +0.1
Paulton Rovers 2 Yate Town 0 +0.0
Week of 4/28None
Points
Chance Will Make Playoffs