Seattle Seahawks Playoff Chances 2012 50/50

Beat St. Louis 20-13, average seed down 0.6 to 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 12/13100.0*Chance in playoffs100.0*Average seed
Buffalo 17 Seattle 50 +12.0
+0.7
Chicago 13 Green Bay 21 +2.8
+0.1
St. Louis 22 Minnesota 36 +1.1
+0.0
Cleveland 21 Washington 38 -1.1
Atlanta 34 NY Giants 0 +0.9
+0.1
New Orleans 41 Tampa Bay 0 +0.8
Dallas 27 Pittsburgh 24 -0.7
New England 34 San Francisco 41 -0.3
Week of 12/22100.0*Chance in playoffs100.0*Average seed
Seattle 42 San Francisco 13 In
+0.8
Philadelphia 20 Washington 27 -2.8
-0.1
Houston 6 Minnesota 23 -2.8
-0.1
Arizona 13 Chicago 28 -2.7
-0.1
Dallas 31 New Orleans 34 +0.4
Baltimore 33 NY Giants 14 +0.1
Week of 12/30100.0*Chance in playoffs100.0*Average seed
Seattle 20 St. Louis 13 +0.6
San Francisco 27 Arizona 13 -0.6
Minnesota 37 Green Bay 34 +0.1
Games Above .500
Chance Will Make Playoffs