Kansas City Chiefs Playoff Chances 2013-2 50/50

Lost to San Diego 24-27, average seed unchanged at 5
11-5-0   .688

How are these numbers calculated?

Big Games

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

Week of 12/12100.0*Chance in playoffs100.0*Average seed
Miami 24 New England 20 -0.1
Kansas City 56 Oakland 31 In
+0.5
Pittsburgh 30 Cincinnati 20 +0.0
San Diego 27 Denver 20 +0.3
Week of 12/22100.0*Chance in playoffs100.0*Average seed
Indianapolis 23 Kansas City 7 -0.8
Denver 37 Houston 13 -0.7
Week of 12/29None
Games Above .500
Chance Will Make Playoffs