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
Jenn 75.58 Eric 99.54 -19.1
-0.5
Erica 60.14 Ethan 78 +6.7
+0.3
Laurel 111.2 Riley 84.2 +5.4
+0.1
Justin 92.66 Tom K 89.34 +1.6
+0.1
Shara 89.14 Shawn 94.36 +1.3
+0.1
Dave 88.54 Tom H 112.22 +0.6
+0.1
Week of 12/1100.0*Chance in playoffs100.0*Average seed
Justin 101.08 Shawn 89.04 In
+0.6
Shara 91.96 Ethan 113.3 In
+0.6
Jenn 86 Riley 84.44 +0.1
Games Above .500
Chance Will Make Playoffs