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
Barnstaple Town 0 Cinderford Town 2 Out
Cirencester Town 5 Street 0 Out
-0.3
Fleet Town 0 Melksham Town 3 -0.2
Paulton Rovers 0 Thatcham Town 1 -0.1
Totton 4 Bideford 0 -0.0
Week of 4/20100.0*Chance in playoffs100.0*Average seed
Street 1 Totton 0 +0.7
Barnstaple Town 2 Street 4 +0.6
Paulton Rovers 1 Bideford 2 -0.1
Melksham Town 1 Winchester City 4 +0.1
Yate Town 3 Melksham Town 2 +0.1
Totton 0 Thatcham Town 3 -0.1
Bideford 2 Slimbridge 0 -0.1
Thatcham Town 3 Larkhall Athletic 1 -0.1
Week of 4/27100.0*Chance in playoffs100.0*Average seed
Street 3 Yate Town 0 +0.7
Thatcham Town 0 Slimbridge 1 +0.3
Mangotsfield 3 Totton 0 +0.3
Bideford 3 Evesham United 1 -0.1
Melksham Town 0 Cirencester Town 1 +0.1
Points
Chance Will Make Playoffs