How are these numbers calculated?

Big Games

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

Week of 1/12100.0*Chance in playoffs100.0*Average seed
Orlando 26 London 35 -0.5
-0.1
St. Paul 62 North Carolina 45 -0.4
-0.1
London 19 Mississippi 77 +0.0
Week of 1/24100.0*Chance in playoffs100.0*Average seed
North Carolina 48 Chicago 77 -2.9
-0.2
Week of 1/25None
Games Above .500
Chance Will Make Playoffs