How are these numbers calculated?

Big Games

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

Week of 10/20100.0*Average seed
New York 19 Tampa Bay 21 +0.4
St. Louis 45 Evansville 38 +0.1
Detroit 45 Ohio 58 -0.1
Los Angeles 45 Boston 52 -0.1
Week of 10/26100.0*Average seed
London 55 Tampa Bay 57 +0.2
D.C. 52 Ohio 59 -0.1
Evansville 44 Detroit 24 -0.1
Week of 11/2None
Games Above .500
Chance Will Make Playoffs