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*Champions100.0*Average seed
Cirencester Town 5 Street 0 +3.1
+0.2
+0.3
Winchester City 1 Bristol Manor F 3 +2.4
+0.1
Barnstaple Town 0 Cinderford Town 2 -1.7
-0.0
Evesham United 3 Moneyfields 1 +0.1
Yate Town 1 Blackfield & La 4 -0.2
Week of 4/20100.0*Chance in playoffs100.0*Champions100.0*Average seed
Melksham Town 1 Winchester City 4 -0.4
Cinderford Town 5 Yate Town 1 -0.3
Winchester City 3 Blackfield & La 0 -0.3
Cirencester Town 6 Mangotsfield 1 In
+0.3
Moneyfields 3 Cirencester Town 3 +0.3
No
+0.1
Slimbridge 1 Cinderford Town 3 -0.2
-0.1
Blackfield & La 4 Evesham United 0 No
Fleet Town 1 Moneyfields 5 -0.2
Yate Town 3 Melksham Town 2 -0.1
Week of 4/27100.0*Chance in playoffs100.0*Champions100.0*Average seed
Melksham Town 0 Cirencester Town 1 +0.6
Street 3 Yate Town 0 +0.3
Moneyfields 0 Larkhall Athletic 1 +0.3
Cinderford Town 0 Winchester City 0 +0.1
Points
Chance Will Make Playoffs