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
Los Angeles 45 Boston 52 +0.4
Detroit 45 Ohio 58 -0.1
New York 19 Tampa Bay 21 -0.1
Baltimore 41 London 51 -0.1
Week of 10/26100.0*Average seed
Boston 42 St. Louis 37 +0.9
Evansville 44 Detroit 24 -0.2
D.C. 52 Ohio 59 -0.2
Week of 11/2100.0*Average seed
Boston 40 D.C. 35 +0.5
Evansville 41 London 36 -0.3
Games Above .500
Chance Will Make Playoffs