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
South Africa 97 USA 0 +19.9
+1.9
South Africa 31 England 24 Out
-1.4
France 45 USA 3 +1.6
+0.1
New Zealand 14 Australia 10 +0.1
-0.0
Wales 26 Scotland 21 +0.1
-0.0
Argentina 28 Samoa 16 +0.1
-0.0
Ireland 46 Fiji 3 +0.1
-0.0
Argentina 44 Scotland 13 -0.1
Ireland 19 Australia 15 -0.1
Wales 42 Samoa 3 -0.1
New Zealand 59 Fiji 6 -0.1
If winner is:HomeDrawAway
Week of 6/13100.0*Chance in playoffs100.0*Average seed
France vs South Africa-1.4-1.4+0.2
New Zealand vs Ireland-0.1+0.1+0.1
Wales vs Argentina-0.0+0.2-0.0

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs123456789101112Count
261-0-0Out712638,272,200,189
240-1-0Out0495221,549,315
220-0-1Out1001,147,114,736
Total:Out6122179,640,864,240
Games Above .500
Chance Will Make Playoffs