How are these numbers calculated?

Big Games

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

Week of 5/24100.0*Average seed
AC Milan 2 AS Roma 3 -0.3
AC Siena 0 Juventus 3 -0.1
Lecce 1 Fiorentina 1 +0.1
Week of 5/31100.0*Average seed
Fiorentina 0 AC Milan 2 +0.5
Juventus 2 Lazio 0 -0.1
Points
Chance Will Win Championship