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 +32.1
+4.0
+0.4
Peterborough 1 Southampton 3 -15.6
-0.9
-0.2
Reading 1 Nottm Forest 0 +15.3
+1.8
+0.2
West Ham 6 Brighton 0 -1.1
-1.1
Bristol City 1 West Ham 1 +1.1
+0.9
+0.0
Week of 4/21100.0*Chance wins title100.0*Promoted100.0*Average seed
Middlesbrough 2 Southampton 1 +14.1
+0.1
Reading 2 Crystal Palace 2 +3.4
+0.0
Week of 4/28None
Points
Chance Will Win Championship