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
Justin 117.72 Erica 70.68 -24.3
-1.2
Shara 71.8 Tom H 63.14 -3.5
-0.1
Laurel 94.74 Jenn 97.14 -3.0
-0.1
Ethan 111.1 Shawn 96.48 +2.9
+0.1
Tom K 52.98 Riley 68.8 -1.7
-0.1
Dave 93.34 Eric 88.58 -1.0
-0.1
If winner is:HomeAway
Week of 11/24100.0*Chance in playoffs100.0*Average seed
Erica vs Ethan+19.3-19.3
+1.0-1.0
Justin vs Tom K-3.4+3.4
-0.1+0.1
Jenn vs Eric-3.0+3.0
-0.1+0.1
Laurel vs Riley+2.3-2.3
+0.1-0.1
Shara vs Shawn-1.8+1.8
Dave vs Tom H-1.1+1.1
-0.1+0.1

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456789101112Count
72-081.5%315313316204,178,343
61-18.71830362148,354,716
50-2Out032163134,180,077
Total:24.7%1481219191618316,713,136
Games Above .500
Chance Will Make Playoffs