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 +2.4
-0.1
Dave 88.54 Tom H 112.22 Out
-0.5
Justin 92.66 Tom K 89.34 +0.7
+0.1
Laurel 111.2 Riley 84.2 +0.7
+0.1
Erica 60.14 Ethan 78 +0.6
+0.1
Jenn 75.58 Eric 99.54 +0.3
+0.0
Week of 12/1100.0*Chance in playoffs100.0*Average seed
Erica 85.38 Dave 97.96 +0.7
Laurel 99.06 Tom H 84.46 +0.1
Tom K 59.98 Eric 102.96 +0.0
Games Above .500
Chance Will Make Playoffs