How are these numbers calculated?

Big Games

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

Week of 4/3100.0*Average seed
Atromitos 1 Panetolikos 0 -0.7
Platanias 3 Xanthi 1 +0.1
Levadiakos 1 Giannina 1 +0.1
Iraklis 0 Olympiakos 2 +0.1
Week of 4/10100.0*Average seed
Panetolikos 2 Olympiakos 5 -0.2
Panthrakikos 0 Iraklis 3 -0.1
Veria 1 Xanthi 1 +0.1
PAOK 2 Levadiakos 0 +0.1
Week of 4/17100.0*Average seed
Xanthi 0 Giannina 1 +0.5
Iraklis 0 Panetolikos 0 -0.3
Levadiakos 3 AEK 0 -0.2
Points
Chance Will Make Playoffs