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
Bristol 22 Bath 57 -9.0
-1.1
Harlequins 18 Edinburgh 23 -1.1
-0.1
Treviso 0 Gloucester 41 -0.4
Grenoble 31 Newcastle 27 +0.4
+0.2
Pau 21 Cardiff 22 -0.3
-0.0
Dragons 34 Enisey 10 -0.1
If winner is:HomeDrawAway
Ospreys vs Lyon+0.2-0.1-0.5
+0.0-0.1-0.1
Saracens vs Stade Français+0.3+0.3-0.0
+0.2+0.0-0.0
If winner is:HomeDrawAway
Week of 1/19100.0*Chance in playoffs100.0*Average seed
Cardiff vs BristolOutOut+7.5
-0.4+0.4+2.0
Lyon vs Grenoble-0.1+0.3+0.5
-0.0+0.0+0.1
Edinburgh vs Saracens-0.0+0.2+0.5
-0.0+0.0+0.1
La Rochelle vs Treviso-0.1*+0.0+0.3
+0.0-0.0-0.2
Stade Français vs Harlequins-0.1*+0.1+0.2
-0.1-0.1+0.1
Worcester vs Enisey+0.0+0.2-0.0
-0.0-0.3+0.0
Newcastle vs Ospreys-0.2*-0.0+0.0
-0.3-0.2+0.1
Brive vs Dragons-0.0*-0.0+0.1
-0.1-0.2+0.1
Gloucester vs Bayonne+0.0-0.0-0.2
Bath vs Pau+0.0-0.1-0.2

* 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 Bristol finish out the regular season.   Explain

100100100100100100100100100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs1234567891011121314151617181920Count
121-0-08.9%0171087101924130002,942,864
100-1-0Out01726412410132,249
80-0-1Out00041732277760015,869,047
Total:1.4%00111151731256650018,944,160
Games Above .500
Chance Will Make Playoffs