Seattle Seahawks Playoff Chances 2014 50/50

Beat St. Louis 20-6, average seed up 1.5 to 1
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
Seattle 17 San Francisco 7 +16.3
+0.9
Detroit 16 Minnesota 14 -3.7
-0.1
Buffalo 21 Green Bay 13 +2.2
+0.1
Philadelphia 27 Dallas 38 +2.0
St. Louis 6 Arizona 12 -1.2
-0.4
Week of 12/18100.0*Chance in playoffs100.0*Average seed
Washington 27 Philadelphia 24 +3.1
+0.1
Dallas 42 Indianapolis 7 In
Tampa Bay 3 Green Bay 20 -0.8
-0.1
Chicago 14 Detroit 20 -0.8
-0.1
Arizona 6 Seattle 35 +1.5
Week of 12/28100.0*Chance in playoffs100.0*Average seed
Seattle 20 St. Louis 6 +1.5
San Francisco 20 Arizona 17 +0.5
Games Above .500
Chance Will Make Playoffs