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
Southold 76 Port Jefferson 55 -12.5
-0.4
Mattituck 95 Shelter Island 49 -3.4
-0.1
Center Moriches 81 Pierson 50 -3.4
-0.1
Mattituck 87 Greenport 45 -3.3
-0.1
Center Moriches 98 BBP 55 -3.1
-0.1
Hampton Bays 77 Westhampton 71 -2.1
-0.1
Riverhead 58 Southampton 62 -1.3
-0.1
Longwood 54 Southampton 66 -1.1
-0.1

What If

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

100100100100100100100100100100100100100100100100100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs12345678910111213141516171819202122232425262728Count
86-0In9378,599
75-199.6%315117051,649
64-250.10743473129,855
53-31.725346172,581
42-4Out2944129,535
31-5Out425851,900
20-6Out6948,595
Total:23.2%461228418552,714
Games Above .500
Chance Will Make Playoffs