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 +9.8
+0.3
Mattituck 95 Shelter Island 49 +9.0
+0.3
Southold 76 Port Jefferson 55 +4.1
+0.1
Center Moriches 81 Pierson 50 -3.7
-0.1
Riverhead 58 Southampton 62 -3.2
-0.1
Center Moriches 98 BBP 55 -3.1
-0.1
Longwood 54 Southampton 66 -2.7
-0.1
Hampton Bays 77 Westhampton 71 -1.7
-0.1

What If

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

100100100100100100100100100100100100100100100100100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs12345678910111213141516171819202122232425262728Count
125-0In10017,454
114-1In7821186,790
103-299.2%2252251172,265
92-381.311664180172,483
81-424.3124581786,472
70-50.40257517,250
Total:79.0%222532165552,714
Games Above .500
Chance Will Make Playoffs