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
Riverhead 58 Southampton 62 +3.8
+0.1
Longwood 54 Southampton 66 +2.1
+0.1
Center Moriches 81 Pierson 50 -2.1
-0.1
Southold 76 Port Jefferson 55 +0.9
+0.1
Center Moriches 98 BBP 55 -0.7
-0.0
Mattituck 87 Greenport 45 -0.6
-0.0
Mattituck 95 Shelter Island 49 -0.5
Hampton Bays 77 Westhampton 71 -0.4

What If

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

100100100100100100100100100100100100100100100100100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs12345678910111213141516171819202122232425262728Count
95-0In5444228,079
84-180.3%1255320189,760
73-28.5087715505,006
62-30.104555656,687
51-4Out36640416,228
40-5Out5932103,444
Total:11.8%138464201,899,204
Games Above .500
Chance Will Make Playoffs