How are these numbers calculated?

Big Games

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

Week of 1/12100.0*Chance in playoffs100.0*Average seed
Dragons 34 Enisey 10 +16.4
+1.9
Harlequins 18 Edinburgh 23 -1.2
-0.1
Treviso 0 Gloucester 41 -0.5
Grenoble 31 Newcastle 27 +0.4
+0.2
Bristol 22 Bath 57 -0.2
+0.0
Pau 21 Cardiff 22 -0.1
If winner is:HomeDrawAway
Ospreys vs Lyon+0.1*-0.3-0.3
+0.0-0.1-0.1
Saracens vs Stade Français+0.2+0.1-0.0
If winner is:HomeDrawAway
Week of 1/19100.0*Chance in playoffs100.0*Average seed
Brive vs Dragons-38.7-37.9In
-2.7-1.5+4.2
Cardiff vs Bristol-0.2*-0.3+1.1
-0.0-0.1+0.0
Edinburgh vs Saracens-0.0*+0.1+1.1
-0.0-0.0+0.1
La Rochelle vs Treviso-0.1*-0.2+0.8
Lyon vs Grenoble-0.1*+0.0+0.4
-0.0+0.0+0.2
Stade Français vs Harlequins-0.1*+0.1+0.1
-0.1+0.0+0.1
Bath vs Pau-0.0+0.0+0.1
Newcastle vs Ospreys-0.1+0.0+0.0
Worcester vs Enisey+0.0+0.1-0.0

* A starred number could be exactly 0 or just really small. The simulation did not run long enough to know.

What If

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

100100100100100100100100100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs1234567891011121314151617181920Count
161-0-0In171013697,378,251
140-1-01.5%00120502720132,886
120-0-10.700192827136761100011,433,023
Total:39.4%0345270006171684431000018,944,160
Games Above .500
Chance Will Make Playoffs