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
Avi & Natalie 79.72 Kevin & Caitlin 74.56 -12.9
-0.7
Joe & Alice 133.26 Jenn & Shara 112.2 -1.5
Eric & Melissa 114.18 Rob & Craig 122.34 -0.3
Justin & Laurel 122.2 Shawn & Erica 108.12 -0.2
Week of 12/1100.0*Chance in playoffs100.0*Average seed
Kevin & Caitlin 69.72 Jenn & Shara 125.08 Out
-0.3
Eric & Melissa 93.26 Justin & Laurel 80.96 -0.3
-0.3
Joe & Alice 126.6 Avi & Natalie 114.84 -0.3
Rob & Craig 134.34 Shawn & Erica 96.7 -0.2
If winner is:HomeAway
Week of 12/8100.0*Chance in playoffs100.0*Average seed
Shawn & Erica vs Kevin & Caitlin-0.1+0.2
Joe & Alice vs Eric & Melissa+0.1-0.1

What If

Chances based on how well the Kevin & Caitlin finish out the regular season.   Explain

100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs12345678Count
61-0Out277342,585,825
50-1Out10073,159,983
Total:Out1090115,745,808
Games Above .500
Chance Will Make Playoffs