How are these numbers calculated?

Big Games

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

Week of 4/13100.0*Chance in playoffs100.0*Average seed
Evesham United 3 Moneyfields 1 +1.7
+0.3
Winchester City 1 Bristol Manor F 3 +1.4
+0.1
Barnstaple Town 0 Cinderford Town 2 -0.4
-0.1
Cirencester Town 5 Street 0 -0.1
+0.0
Totton 4 Bideford 0 -0.1
Week of 4/20100.0*Chance in playoffs100.0*Average seed
Blackfield & La 4 Evesham United 0 -2.7
-0.2
Cinderford Town 5 Yate Town 1 -2.0
-0.1
Melksham Town 1 Winchester City 4 -1.6
-0.1
Moneyfields 3 Cirencester Town 3 -0.1
Street 1 Totton 0 +0.1
Week of 4/27None
Points
Chance Will Make Playoffs