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
Northeast 3 Chesapeake 14 -0.5
Games Above .500
Chance Will Make Playoffs