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 -4.9
-0.7
Avi & Natalie 79.72 Kevin & Caitlin 74.56 +1.2
Eric & Melissa 114.18 Rob & Craig 122.34 -1.0
Joe & Alice 133.26 Jenn & Shara 112.2 -0.7
+0.1
Week of 12/1100.0*Chance in playoffs100.0*Average seed
Rob & Craig 134.34 Shawn & Erica 96.7 -17.1
-0.9
Kevin & Caitlin 69.72 Jenn & Shara 125.08 -1.7
-0.1
Joe & Alice 126.6 Avi & Natalie 114.84 -1.0
-0.1
Eric & Melissa 93.26 Justin & Laurel 80.96 +0.1
+0.2
If winner is:HomeAway
Week of 12/8100.0*Chance in playoffs100.0*Average seed
Shawn & Erica vs Kevin & Caitlin+29.0-49.8
+0.7-1.2
Avi & Natalie vs Rob & Craig+21.8-6.9
+0.4-0.1
Joe & Alice vs Eric & Melissa-0.7+1.2
-0.2+0.3
Justin & Laurel vs Jenn & Shara-0.7+0.7

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
81-094.6%235120573,159,983
70-115.81675942,585,825
Total:65.6%153219313115,745,808
Games Above .500
Chance Will Make Playoffs