How are these numbers calculated?

Big Games

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

Week of 4/23100.0*Average seed
Olympiakos 5 Giannina 0 -0.1
Panathinaikos 1 Atromitos 0 +0.1
Iraklis 2 Panetolikos 1 +0.0
Week of 4/30100.0*Average seed
Atromitos 4 Platanias 1 -0.2
Giannina 1 AEK 1 +0.1
Points
Chance Will Make Playoffs