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
Laurel 111.2 Riley 84.2 -16.8
-0.6
Jenn 75.58 Eric 99.54 +5.5
+0.1
Erica 60.14 Ethan 78 +5.0
+0.3
Shara 89.14 Shawn 94.36 +2.5
Justin 92.66 Tom K 89.34 -2.1
-0.1
Dave 88.54 Tom H 112.22 -0.2
+0.1
Week of 12/1100.0*Chance in playoffs100.0*Average seed
Jenn 86 Riley 84.44 -0.4
Erica 85.38 Dave 97.96 +0.1
Justin 101.08 Shawn 89.04 -0.1
Games Above .500
Chance Will Make Playoffs