How are these numbers calculated?

Big Games

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

Week of 12/27100.0*Chance in playoffs100.0*Average seed
Mattituck 87 Greenport 45 +0.3
Center Moriches 81 Pierson 50 +0.1
+0.1
Southold 76 Port Jefferson 55 In
+0.1
Sachem North 48 Pierson 38 +0.1

What If

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

100100100100100100100100100100100100100100100100100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs12345678910111213141516171819202122232425262728Count
9-12In100449,224*
81-4In901086,173
70-5In505017,317
Total:In973552,714

* Row combines multiple less frequent records.

Games Above .500
Chance Will Make Playoffs