San Francisco 49ers Playoff Chances 2012 50/50

Beat Arizona 27-13, average seed up 1.2 to 2
11-4-1   .719

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
New England 34 San Francisco 41 In
+0.5
Atlanta 34 NY Giants 0 +0.3
Chicago 13 Green Bay 21 +0.3
-0.1
Buffalo 17 Seattle 50 -0.3
-0.2
Cleveland 21 Washington 38 -0.3
Dallas 27 Pittsburgh 24 -0.1
Week of 12/22100.0*Chance in playoffs100.0*Average seed
Seattle 42 San Francisco 13 -0.5
Green Bay 55 Tennessee 7 -0.2
Detroit 18 Atlanta 31 -0.1
Week of 12/30100.0*Chance in playoffs100.0*Average seed
San Francisco 27 Arizona 13 +0.7
Seattle 20 St. Louis 13 -0.5
Minnesota 37 Green Bay 34 +0.2
Games Above .500
Chance Will Make Playoffs