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
Shara 89.14 Shawn 94.36 -19.9
-0.6
Erica 60.14 Ethan 78 +6.6
+0.2
Jenn 75.58 Eric 99.54 +1.9
+0.0
Justin 92.66 Tom K 89.34 +1.1
-0.0
Dave 88.54 Tom H 112.22 -0.9
Laurel 111.2 Riley 84.2 +0.9
+0.0
Week of 12/1100.0*Chance in playoffs100.0*Average seed
Shara 91.96 Ethan 113.3 Out
-1.0
Erica 85.38 Dave 97.96 +0.3
Games Above .500
Chance Will Make Playoffs