How are these numbers calculated?

Big Games

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

Week of 11/24100.0*Chance in playoffs100.0*Average seed
Justin 92.66 Tom K 89.34 -13.9
-0.7
Shara 89.14 Shawn 94.36 +7.5
+0.6
Erica 60.14 Ethan 78 +2.1
Dave 88.54 Tom H 112.22 +1.7
+0.2
Laurel 111.2 Riley 84.2 +0.8
+0.1
Jenn 75.58 Eric 99.54 -0.1
Week of 12/1100.0*Chance in playoffs100.0*Average seed
Shara 91.96 Ethan 113.3 In
+0.0
Justin 101.08 Shawn 89.04 -12.1
-1.1
Games Above .500
Chance Will Make Playoffs