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
St. Stanislaus vs Vancleave+12.9-17.2
+0.6-0.8
Bay vs Pass Christian-0.4+0.6
East Central vs Moss Point+0.3-0.4
If winner is:HomeAway
Week of 10/9100.0*Chance in playoffs100.0*Average seed
St. Stanislaus vs Bay+12.9-17.2
+0.6-0.8
Pass Christian vs East Central-0.1+0.1

What If

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

100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456Count
55-0In100431,328,757
44-1In712812,095,669,371
33-299.8%939411104,033,927,345
22-352.2011413993,800,589,903
11-41.0128711,755,879,058
00-5Out100324,093,306
Total:68.8%18171716161512,441,487,740
Games Above .500
Chance Will Make Playoffs