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
Winchester City 1 Bristol Manor F 3 +17.7
+0.2
Barnstaple Town 0 Cinderford Town 2 +10.4
+0.2
Cirencester Town 5 Street 0 -1.8
-0.1
Evesham United 3 Moneyfields 1 -0.8
Yate Town 1 Blackfield & La 4 +0.1
Week of 4/20100.0*Chance in playoffs100.0*Average seed
Cinderford Town 5 Yate Town 1 +14.4
+0.4
Winchester City 3 Blackfield & La 0 -10.6
-0.1
Melksham Town 1 Winchester City 4 -10.4
-0.1
Slimbridge 1 Cinderford Town 3 +10.4
+0.3
Blackfield & La 4 Evesham United 0 +1.6
+0.1
Fleet Town 1 Moneyfields 5 -1.1
-0.1
Moneyfields 3 Cirencester Town 3 -0.2
Cirencester Town 6 Mangotsfield 1 -0.2
-0.1
Yate Town 3 Melksham Town 2 -0.0
Week of 4/27100.0*Chance in playoffs100.0*Average seed
Cinderford Town 0 Winchester City 0 In
-0.0
Moneyfields 0 Larkhall Athletic 1 +0.3
Melksham Town 0 Cirencester Town 1 -0.1
Points
Chance Will Make Playoffs