How are these numbers calculated?

Big Games

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

If winner is:HomeDrawAway
Week of 10/27100.0*Chance in playoffs100.0*ERCC100.0*Average seed
Scarlets vs Blues+8.0-5.9-7.5
+8.0-4.9-7.5
+0.3-0.3-0.3
Ospreys vs Dragons+1.4+1.2-1.6
+0.1+1.0-0.2
+0.1+0.0-0.1
Treviso vs Edinburgh-0.1+2.4-0.1
-0.0+1.1-0.1
-0.0+0.1-0.0
Ulster vs Leinster-0.1+2.0-0.1
-0.0+0.7-0.0
-0.0+0.1-0.0
Glasgow vs Kings+0.5+0.5-0.6
-0.0+0.6-0.0
Zebre vs Cheetahs-0.0+1.0-0.0
Connacht vs Munster-0.1+0.9-0.0

What If

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

100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-LplayoffsERCC1234567Count
74-76InYes10067,306*
7214-0-1InYes100076,433*
7013-1-1InYes100096,709*
6813-0-2InYes1000561,899*
6612-1-2InYes10000639,137*
6412-0-3InYes99102,181,366
11-2-2InYes9820354,989*
6211-1-3InYes97302,585,727*
6011-0-4InYes97306,542,693*
10-2-3100.0%Yes928001,305,393*
5810-1-4100.0Yes9010006,773,412
9-3-3100.0Yes782110406,186*
5610-0-5100.0Yes87130014,391,830*
9-2-4100.0Yes74242003,276,064*
549-1-5100.0Yes692820013,556,380
8-3-499.5100.0%4942900915,976*
529-0-699.9100.0643240023,979,832*
8-2-599.1100.04345121005,910,973*
508-1-698.6100.037471510020,328,439
7-3-592.699.917453171001,464,180*
488-0-797.7100.031481920030,812,089*
7-2-689.699.8134235101007,659,453
6-4-569.194.13234225500237,848
467-1-785.499.51037381320023,232,431
6-3-660.988.821840308101,711,025*
447-0-880.498.9733401720030,821,763
6-2-753.382.8114383411107,660,798
5-4-623.534.50320402970240,030*
426-1-845.174.41113437152020,333,486
5-3-717.724.4021638331111,465,426*
406-0-937.264.4072939203023,972,538
5-2-813.016.6011235371415,745,669
4-4-72.40.9021741337170,756*
385-1-99.210.6018304018213,552,422
4-3-81.60.50021338379915,781*
365-0-106.36.3006264223314,384,934
4-2-90.90.2001103542133,277,478*
344-1-100.50.10173145166,779,583
3-3-90.00.0001154835405,273*
324-0-110.30.00052748196,540,025
3-2-100.00.00011247401,305,988*
303-1-110.0No001944462,584,290*
283-0-120.0No00742502,179,516
2-2-110.0No0022771353,032*
262-1-12OutNo012475639,113*
242-0-13OutNo012079562,065*
221-1-13OutNo099197,132*
201-0-14OutNo079376,037*
180-1-14OutNo2986,767
160-0-15OutNo19960,444
Total:68.1%76.6%282318131063313,198,116

* Row combines multiple less frequent records.

Games Above .500
Chance Will Make Playoffs