How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 7/19100.0*Chance wins title100.0*Promoted100.0*Average seed
PSG 2 Tottenham Hotspur 4 -28.4
-28.4
-1.5
Roma 1 PSG 2 +13.6
+13.6
+1.5
Juventus 1 Barcelona 2 -2.0
-2.0
-0.0
Manchester United 2 Manchester City 0 -1.5
-1.5
-0.0
Real Madrid 1 Manchester United 2 -0.2
-0.2
+0.0
Tottenham Hotspur 2 Roma 3 +0.1
+0.1
-0.3
Week of 7/26100.0*Chance wins title100.0*Promoted100.0*Average seed
Barcelona 1 Manchester United 0 +0.4
+0.4
-0.0
PSG 2 Juventus 3 No
No
-1.3
Manchester City 4 Real Madrid 1 -0.1
Roma 1 Juventus 2 +0.1
Manchester City 3 Tottenham Hotspur 0 +0.0
Real Madrid 2 Barcelona 3 +0.0
Points
Chance Will Win Championship