How are these numbers calculated?

Big Games

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

Week of 6/5100.0*Chance in playoffs100.0*Average seed
Argentina 44 Scotland 13 -19.5
-1.8
Argentina 28 Samoa 16 +5.5
+0.2
Wales 26 Scotland 21 -3.1
+0.1
New Zealand 14 Australia 10 +1.5
+0.1
South Africa 31 England 24 +0.7
+0.1
France 45 USA 3 -0.6
Ireland 46 Fiji 3 -0.5
+0.0
Wales 42 Samoa 3 -0.1
Ireland 19 Australia 15 -0.1
France 6 England 30 -0.1
New Zealand 59 Fiji 6 -0.1
South Africa 97 USA 0 -0.1
If winner is:HomeDrawAway
Week of 6/13100.0*Chance in playoffs100.0*Average seed
Scotland vs Samoa-30.0OutIn
-1.3-2.5+1.4
Australia vs Fiji-18.0+17.2+17.2
France vs South Africa-6.7-6.7+7.0
-0.1-0.1+0.1
England vs USA-5.8-5.8+6.1
+0.1-0.4-0.1

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs123456789101112Count
41-0-036.8%3749141,572,014,192
20-1-0Out10073,957,976
00-0-1In2450261,571,937,248
Total:66.9%122413182493,217,909,416
Games Above .500
Chance Will Make Playoffs