Dallas Cowboys Playoff Chances 2014 50/50

Beat Washington 44-17, average seed down 0.3 to 3
12-4-0   .750

How are these numbers calculated?

Big Games

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

Week of 12/11100.0*Chance in playoffs100.0*Average seed
Philadelphia 27 Dallas 38 +30.5
+1.4
Seattle 17 San Francisco 7 -4.2
Detroit 16 Minnesota 14 -2.9
-0.1
Buffalo 21 Green Bay 13 +0.5
+0.0
St. Louis 6 Arizona 12 -0.3
-0.0
Week of 12/18100.0*Chance in playoffs100.0*Average seed
Dallas 42 Indianapolis 7 In
+0.5
Washington 27 Philadelphia 24 +6.9
+0.6
Tampa Bay 3 Green Bay 20 -2.3
-0.1
Chicago 14 Detroit 20 +0.8
-0.1
Arizona 6 Seattle 35 +0.1
Week of 12/28100.0*Chance in playoffs100.0*Average seed
Seattle 20 St. Louis 6 -0.3
San Francisco 20 Arizona 17 +0.2
Games Above .500
Chance Will Make Playoffs