How are these numbers calculated?

Big Games

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

Week of 4/11100.0*Chance in playoffs100.0*Average seed
Madureira 0 Boavista 0 +2.2
Fluminense 3 Nova Iguacu 1 -2.0
-0.1
Week of 4/15100.0*Chance in playoffs100.0*Average seed
Boavista 2 Vasco da Gama 2 In
+0.1
Portuguesa 2 Flamengo 2 +2.7
-0.3
Flamengo 1 Vasco da Gama 3 -2.3
+0.1
Madureira 4 Macae 2 -1.9
Fluminense 1 Botafogo 0 -1.4
-0.2
Bangu 1 Volta Redonda 1 +0.0
If winner is:HomeDrawAway
Week of 4/25100.0*Chance in playoffs100.0*Average seed
Portuguesa vs Boavista+1.0-0.6-0.6
Fluminense vs Madureira-0.2+0.1+0.1
Flamengo vs Volta Redonda+0.0-0.1+0.0

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs123456789101112RelegationCount
211-0-0In59392No451,789,321
18-19In100No736,804,015*
Total:In221563No1,188,593,336

* Row combines multiple less frequent records.

Points
Chance Will Make Playoffs