How are these numbers calculated?

Big Games

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

Week of 11/22100.0*Relegated to Fédérale 1100.0*Average seed
Narbonne 36 Tarbes 23 +9.5
-0.5
Bourgoin 14 Montauban 20 -1.6
+0.3
Massy 50 Dax 13 -0.2
+0.2
Albi 34 Carcassonne 22 +0.1
+0.1
Aurillac 20 Colomiers 13 -0.1
Mont-de-Marsan 32 Béziers 18 -0.0
Biarritz 42 Agen 18 -0.0
Week of 11/29100.0*Relegated to Fédérale 1100.0*Average seed
Tarbes 26 Massy 7 -37.8
+0.6
Colomiers 24 Bourgoin 17 No
+0.2
Agen 22 Dax 17 +0.1
Week of 12/7100.0*Relegated to Fédérale 1100.0*Average seed
Narbonne 7 Biarritz 20 +0.5
Games Above .500
Chance Will Win Championship