How are these numbers calculated?

Big Games

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

Week of 5/11100.0*Average seed
AS Roma 2 Atalanta BC 1 -0.3
Genoa 0 Lazio 2 -0.3
Palermo 0 Sampdoria 2 +0.2
Inter Milan 2 AC Siena 2 -0.2
Udinese 0 Cagliari Calcio 2 -0.1
Napoli 3 AC Milan 1 -0.0
Week of 5/17100.0*Average seed
Atalanta BC 2 Genoa 0 +0.7
Lazio 2 Napoli 1 -0.2
Cagliari Calcio 2 Reggina Calcio 2 +0.1
AC Siena 2 Palermo 2 -0.1
Points
Chance Will Win Championship