How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 2/2100.0*Average seed
Flatbush 78 DRS 68 -0.5
Haftr 43 North Shore 40 -0.2
HANC 65 Ezra 25 +0.2
JEC 64 Magen David 79 -0.2
If winner is:HomeAway
Week of 2/9100.0*Average seed
Magen David vs North Shore-0.3+0.3
Magen David vs Flatbush-0.3+0.3
YDE vs Magen David+0.3-0.3

What If

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

100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs12345678910Count
70-0In50505,457,120
Total:In50505,457,120
Games Above .500
Chance Will Make Playoffs