How are these numbers calculated?

Big Games

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

Week of 11/23100.0*Average seed
Arsenal 2 PSG 2 -0.2
Week of 12/8100.0*Average seed
PSG 2 Ludogorets 2 +0.4
Basel 1 Arsenal 4 +0.1
Points
Chance Will Make Playoffs