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 +22.5
+1.1
Shara 71.8 Tom H 63.14 -3.4
-0.1
Ethan 111.1 Shawn 96.48 +3.1
+0.1
Laurel 94.74 Jenn 97.14 -3.1
-0.1
Tom K 52.98 Riley 68.8 -1.6
-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
Justin vs Tom K+19.1-19.1
+1.0-1.0
Erica vs Ethan-3.4+3.4
-0.1+0.1
Jenn vs Eric-2.2+2.2
-0.2+0.2
Laurel vs Riley+2.1-2.1
-0.1+0.1
Dave vs Tom H-1.4+1.4
-0.1+0.1
Shara vs Shawn+0.9-0.9
-0.1+0.1

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456789101112Count
82-0In125131504,179,258
71-195.2%63138214008,352,813
60-220.321835311314,181,065
Total:77.7%3162321151183016,713,136
Games Above .500
Chance Will Make Playoffs