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 wins title100.0*Promoted100.0*Average seed
Southampton 1 Reading 3 +39.8
+4.8
+0.5
Peterborough 1 Southampton 3 -12.8
-0.5
-0.1
Reading 1 Nottm Forest 0 +10.3
+1.4
+0.1
Bristol City 1 West Ham 1 +0.8
+1.0
West Ham 6 Brighton 0 -0.4
-0.7
Week of 4/21100.0*Chance wins title100.0*Promoted100.0*Average seed
Middlesbrough 2 Southampton 1 +18.2
+0.2
Reading 2 Crystal Palace 2 -5.9
-0.1
Week of 4/28None
Points
Chance Will Win Championship