How are these numbers calculated?

Big Games

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

Week of 4/13100.0*Chance wins title100.0*Average seed
PAOK 0 AEK Athens 4 -21.3
-0.2
Skoda Xanthi 1 Olympiakos 4 +20.7
+0.2
Panathinaikos 1 Aris FC 0 -0.2
Iraklis 5 Kalamarias 2 -0.2
Asteras 1 Levadiakos 2 -0.2
Week of 4/20100.0*Chance wins title100.0*Average seed
Olympiakos 3 Iraklis 1 Yes
+0.2
AEK Athens 2 Asteras 0 -8.5
-0.1
Panionios 2 Atromitos 1 +0.2
AE Larissa 4 PAOK 3 +0.2
Points
Chance Will Win Championship