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 9/20100.0*Chance in playoffs100.0*Average seed
Wales vs Georgia+18.5+2.1-18.6
+2.6-0.1-2.6
Australia vs Fiji+0.0-1.4+0.0
+0.0-0.2+0.0
Fiji vs Uruguay+0.0-1.4+0.0
+0.0-0.2+0.0
Japan vs Russia+0.0-0.0-0.1
Russia vs Samoa-0.0+0.1-0.0
Ireland vs Scotland-0.0+0.1-0.0
England vs United States-0.0+0.1-0.0
France vs Argentina-0.0+0.1-0.0
Italy vs Namibia-0.0+0.1-0.0
Italy vs Canada-0.0+0.1-0.0
England vs Tonga-0.0+0.1-0.0
New Zealand vs South Africa-0.0+0.1-0.0
If winner is:HomeDrawAway
Week of 9/28100.0*Chance in playoffs100.0*Average seed
Australia vs Wales-18.6+2.1+18.5
-2.6-0.1+2.6
Georgia vs Fiji+0.0-1.4+0.0
+0.0-0.2+0.0
Georgia vs Uruguay+0.0-1.4+0.0
+0.0-0.2+0.0
Japan vs Ireland+0.0-0.0-0.1
Scotland vs Samoa-0.0+0.1-0.0
Ireland vs Russia-0.0+0.1-0.0
Argentina vs Tonga-0.0+0.1-0.0
South Africa vs Namibia-0.0+0.1-0.0
New Zealand vs Canada-0.0+0.1-0.0
France vs United States-0.0+0.1-0.0

What If

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

100100100100100100100100100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-OTLDplayoffs1234567891011121314151617181920Count
164-000In52351211,679,060,249
143-001In1444338000169,636,031
123-01097.1%210192220157230006,702,114,987
2-002100.0192127231451006,437,251
102-01179.7000212272811182000508,898,022
1-00385.10041529271013200108,606
82-02025.00000138121315141311620000010,053,130,183
1-01219.70002612101518171262000012,875,197
0-00412.204831526251251681
61-0210.000002924332381000508,877,307
0-0130.4000192534227100108,769
41-030Out000139151820181246,702,139,492
0-022Out0000151629281746,441,075
20-031Out0006264425169,653,764
00-040Out1931591,679,015,986
Total:40.0%4555555565555555555528,198,497,600
Points
Chance Will Make Playoffs