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
Dallas 44 LA Rams 21 -8.1
-0.4
Washington 27 Philadelphia 37 +6.9
+0.5
Detroit 17 Tampa Bay 38 -0.2
San Francisco 22 Atlanta 29 -0.1
Green Bay 21 Chicago 13 +0.1
Carolina 24 Seattle 30 +0.0
Week of 12/22100.0*Chance in playoffs100.0*Average seed
Philadelphia 17 Dallas 9 +40.0
+2.2
Chicago 3 Kansas City 26 +0.1
Atlanta 24 Jacksonville 12 -0.0
Indianapolis 38 Carolina 6 +0.0
Week of 12/29100.0*Chance in playoffs100.0*Average seed
NY Giants 17 Philadelphia 34 In
+1.5
Dallas 47 Washington 16 -5.4
-0.2
Tampa Bay 22 Atlanta 28 +0.2
Minnesota 19 Chicago 21 -0.2
LA Rams 31 Arizona 24 -0.1
Games Above .500
Chance Will Make Playoffs