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 +20.1
+1.9
South Africa 31 England 24 Out
-1.7
France 45 USA 3 +2.1
+0.2
New Zealand 14 Australia 10 +0.9
-0.1
Wales 26 Scotland 21 +0.7
-0.1
Argentina 28 Samoa 16 +0.7
-0.1
France 6 England 30 -0.1
Ireland 19 Australia 15 -0.1
New Zealand 59 Fiji 6 -0.1
Argentina 44 Scotland 13 -0.1
Ireland 46 Fiji 3 -0.1
If winner is:HomeDrawAway
Week of 6/13100.0*Chance in playoffs100.0*Average seed
France vs South Africa-0.8-0.7+0.8
New Zealand vs Ireland-0.1+0.1+0.1
Wales vs Argentina-0.0+0.1-0.0

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
261-0-0Out682751,571,957,453
240-1-0Out049573,966,151
220-0-1Out1001,571,985,812
Total:Out3313543,217,909,416
Games Above .500
Chance Will Make Playoffs