How are these numbers calculated?

Big Games

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

Week of 11/17100.0*Chance in playoffs100.0*Average seed
Ethan 111.1 Shawn 96.48 -12.5
-0.5
Laurel 94.74 Jenn 97.14 -5.5
-0.2
Shara 71.8 Tom H 63.14 -2.0
-0.1
Tom K 52.98 Riley 68.8 -1.4
-0.1
Dave 93.34 Eric 88.58 -1.2
-0.1
Justin 117.72 Erica 70.68 +1.0
If winner is:HomeAway
Week of 11/24100.0*Chance in playoffs100.0*Average seed
Shara vs Shawn-20.4+27.7
-0.9+1.3
Erica vs Ethan-5.1+2.0
-0.3+0.1
Laurel vs Riley+1.7-3.2
+0.1-0.2
Justin vs Tom K-1.3+3.5
-0.0+0.1
Jenn vs Eric-2.8+1.0
-0.1+0.0
Dave vs Tom H-0.8+1.7
-0.1+0.2

What If

Chances based on how well the Shawn finish out the regular season.   Explain

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456789101112Count
72-091.8%12338307109,028,312
61-114.2113333616124,481,236
50-2Out1144342116,629,860
Total:23.5%0471218222214050,139,408
Games Above .500
Chance Will Make Playoffs