EAC formula Typical or ATypical

I am reviewing math questions fromm the 101 Scribd samples.


For anyone that has a copy i am working with Question 100


The question premises is:


The team lead promises that this was UNUSUAL that the issue have been resolved and that the project will now return to normal.


Answer Given: 


use the Atypical EAC formula.


Question:


why would you not use Typical EAC Formula. There was a variance in the past but now the future is expected to be normal (Would the word Normal not refrence  typical).


My understanding for the EAC Typical Formula is "CURRENT variances are thought to be Typical in the Future".


I might be missing the meaning of Typical compared to ATypical, Help Pls


 


 

This is a Clear example of aTypical formulae because, the team has clearly promised that this won't happen again and going forward the BAC estimates should work.

Hence, AC + (BAC - EV)  is perfect !