Roll Return: CFAI Reading 6 Q11-A understand, reading, average

Analti_Calte

Can someone please explain the roll return calc in 11-A in reading 36 EOC Qs? I understand the RR(9,1), but how do you get the 9,2; 9,3; 9,4. Also, I don’t get how you assume to go through those three add’l calcs to get the average they are looking for?

Muddahudda

Sorry, subject should be CFA Reading 36

giants2010

They take the Jan - Sept numbers, add up and divide by 9.
Then they take Feb - Oct number, add up and divide by 9. Same with Mar-Nov & April - Dec. Once you have these four numbers they add them together and divide by 4.

SFoyil

Are we assumed to always take this approach to a roll return question? I think I am missing something in the reading.