How are these numbers calculated?

Big Games

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

Week of 8/23None
Week of 8/30100.0*Average seed
Roosters 22 Titans 30 -0.1
Tigers 18 Rabbitohs 32 -0.1
Week of 9/5100.0*Average seed
Rabbitohs 12 Roosters 24 +0.1
Games Above .500
Chance Will Make Playoffs