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*League Two100.0*Average seed
Bury 0 Oldham 1 -17.1
+0.5
Oldham 1 Yeovil 0 -11.1
+0.5
Bury 2 Scunthorpe 1 -8.1
+0.1
Scunthorpe 1 Walsall 1 -3.1
+0.0
Brentford 3 Portsmouth 2 -2.4
+0.1
Colchester 0 MK Dons 2 -1.2
+0.2
Notts County 3 Colchester 1 -0.8
+0.1
Shrewsbury 0 Bournemouth 3 -0.4
+0.1
Tranmere 0 Hartlepool 1 +0.3
Week of 4/20100.0*League Two100.0*Average seed
MK Dons 0 Scunthorpe 1 +2.8
Oldham 2 Crawley Town 1 No
+0.4
Colchester 0 Shrewsbury 0 +0.1
+0.1
Shrewsbury 1 Oldham 0 -0.7
Week of 4/27100.0*League Two100.0*Average seed
Carlisle 0 Colchester 2 -0.3
Shrewsbury 3 Portsmouth 2 -0.2
Leyton Orient 1 Oldham 1 -0.1
Points
Chance Will Win Championship