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 +3.9
+0.1
Mattituck 95 Shelter Island 49 +3.1
+0.1
Center Moriches 81 Pierson 50 -2.8
-0.1
Mattituck 87 Greenport 45 +2.6
+0.1
Riverhead 58 Southampton 62 -1.3
Hampton Bays 77 Westhampton 71 -1.0
-0.1
Center Moriches 98 BBP 55 -0.8
-0.0
Longwood 54 Southampton 66 -0.6

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
125-0In100246,406
114-1In46468637,226
103-297.5%435592635,188
92-377.00473230305,180
81-423.6023601769,226
70-50.6129705,978
Total:92.4%302835711,899,204
Games Above .500
Chance Will Make Playoffs