How are these numbers calculated?

Big Games

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

Week of 5/10100.0*Average seed
Valenciennes 1 Nice 2 +1.2
Metz 1 Lorient 2 -0.2
Strasbourg 1 Caen 4 -0.2
Rennes 2 Toulouse 1 -0.1
Le Mans UC72 0 Marseille 0 -0.0
Lille 2 Lens 1 -0.0
Week of 5/17100.0*Average seed
Nice 3 Caen 1 +0.9
Metz 4 Le Mans UC72 3 +0.4
Nancy 2 Rennes 3 -0.3
Lorient 1 Lille 1 +0.2
Points
Chance Will Win Championship