How are these numbers calculated?

Big Games

How we did yesterday and who we should root for today.   Explain

Tuesday, 4/30100.0*Average seed
Meade 1 Northeast 14 -0.4
Old Mill 12 Glen Burnie 1 +0.2
Friday, 5/3100.0*Average seed
Southern 13 Old Mill 9 -0.1
Games Above .500
Chance Will Make Playoffs