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
Bellport 61 Riverhead 64 +0.9
+1.4
Mt. Sinai 68 Sachem East 58 +0.1
+0.1
ESM 47 Smithtown East 57 -0.1
-0.1
Riverhead 58 Southampton 62 -0.1
-1.0
Northport 75 HHH West 69 -0.1
Comsewogue 64 Lindenhurst 65 +0.1
Smithtown East 72 Floyd 44 -0.1
Copiague 54 Commack 63 -0.1

What If

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

100100100100100100100100100100100100100100100100100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs12345678910111213141516171819202122232425262728Count
135-0In35441830017,214
124-1In21534321430086,450
113-2In003142831175100173,396
102-3In00141325281972000172,237
91-4100.0%0003102330229200086,056
80-596.40031123272210310017,361
Total:99.9%1471012141311865421100000552,714
Games Above .500
Chance Will Make Playoffs