How are these numbers calculated?

Big Games

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

Week of 5/1100.0*Chance wins title100.0*Average seed
Lazio 0 Inter Milan 2 +18.1
+0.2
Parma 1 AS Roma 2 -16.3
-0.2
Week of 5/9100.0*Chance wins title100.0*Average seed
Inter Milan 4 Chievo 3 +11.2
+0.1
AS Roma 2 Cagliari Calcio 1 -11.0
-0.1
Week of 5/15100.0*Chance wins title100.0*Average seed
Chievo 0 AS Roma 2 -26.6
-0.3
AC Siena 0 Inter Milan 1 Yes
+0.2
Points
Chance Will Win Championship