How are these numbers calculated?

Big Games

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

Week of 5/8100.0*Relegated100.0*Average seed
Lecce 2 Napoli 1 -30.2
+0.8
Genoa 2 Sampdoria 1 -7.7
+0.1
Cagliari 0 Cesena 2 +4.4
-0.2
Bologna 0 Parma 0 +0.1
Week of 5/22100.0*Relegated100.0*Average seed
Lecce 2 Lazio 4 -0.4
Palermo 1 Chievo 3 -0.2
Genoa 3 Cesena 2 +0.2
Points
Chance Will Win Championship