How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

If winner is:HomeAway
Week of 10/2100.0*Chance in playoffs100.0*Average seed
Bay vs Pass Christian-15.3+15.3
-0.7+0.7
If winner is:HomeAway
Week of 10/9100.0*Chance in playoffs100.0*Average seed
Pass Christian vs East Central+15.3-15.3
+0.7-0.7

What If

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

100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456Count
55-0In100132,667,498
44-1In70291654,711,064
33-299.8%839421101,309,384,565
22-353.1011423981,309,320,677
11-41.012970654,723,555
00-5Out100132,665,613
Total:66.7%1717171717174,193,472,972
Games Above .500
Chance Will Make Playoffs