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
Justin & Laurel 122.2 Shawn & Erica 108.12 -9.6
-0.8
Avi & Natalie 79.72 Kevin & Caitlin 74.56 +1.6
+0.1
Eric & Melissa 114.18 Rob & Craig 122.34 -0.8
Joe & Alice 133.26 Jenn & Shara 112.2 -0.8
+0.1
Week of 12/1100.0*Chance in playoffs100.0*Average seed
Rob & Craig 134.34 Shawn & Erica 96.7 -17.9
-0.9
Joe & Alice 126.6 Avi & Natalie 114.84 -2.7
-0.2
Eric & Melissa 93.26 Justin & Laurel 80.96 -1.3
+0.1
Kevin & Caitlin 69.72 Jenn & Shara 125.08 -0.1
-0.1
If winner is:HomeAway
Week of 12/8100.0*Chance in playoffs100.0*Average seed
Shawn & Erica vs Kevin & Caitlin+34.8-34.8
+1.1-1.1
Avi & Natalie vs Rob & Craig+15.2-15.2
+0.2-0.2
Joe & Alice vs Eric & Melissa+3.1-3.1
-0.1+0.1
Justin & Laurel vs Jenn & Shara-0.2+0.2

What If

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

100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs12345678Count
81-098.7%40499119,291,963
70-129.129551619,289,973
Total:63.9%20241928838,581,936
Games Above .500
Chance Will Make Playoffs