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
Tucson 44 D.C. 27 +0.3
Fort Worth 31 San Antonio 40 -0.2
Fort McMurray 44 North Dakota 38 -0.2
Week of 10/26100.0*Average seed
Seattle 69 Tucson 73 +0.4
Corpus Christi 45 Los Angeles 60 -0.1
Week of 11/2100.0*Average seed
New York 35 Tucson 62 +0.5
Fort McMurray 54 Fort Worth 35 -0.1
Games Above .500
Chance Will Make Playoffs