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
Ireland 19 Australia 15 +20.1
+1.9
Ireland 46 Fiji 3 -5.9
-0.6
New Zealand 14 Australia 10 -2.2
-0.1
France 45 USA 3 -0.1
Wales 26 Scotland 21 +0.1
-0.0
Argentina 28 Samoa 16 +0.1
-0.0
New Zealand 59 Fiji 6 -0.1
Argentina 44 Scotland 13 -0.1
South Africa 97 USA 0 -0.1
Wales 42 Samoa 3 -0.1
South Africa 31 England 24 -0.0
If winner is:HomeDrawAway
Week of 6/13100.0*Chance in playoffs100.0*Average seed
New Zealand vs Ireland+1.4+3.3-1.6
France vs South Africa+0.4+0.4-0.1
Wales vs Argentina-0.0+0.5-0.0
England vs USA-0.1+0.4+0.4

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs123456789101112Count
251-0-0Out016844,709,705,538
230-1-0Out982221,532,592
210-0-1Out13874,709,626,110
Total:Out264308419,640,864,240
Games Above .500
Chance Will Make Playoffs