Dec 2016 pass exam paper

You will have to be more specific. I haven't time to give a complete explanation of the whole question in the hope I address your difficulties.

Hi Sir Thanks for responding, the parts I am stock on is with reference to note 1 and 2, I understand up to the deviation figures but cannot see how based on the notes he arrived at figures under Svar, seasonal variations for each My mistake the pass paper is Sep/Dec 2016. Regards Diana

You don't really need to know how Svar was calculated as it has been done for you and will not necessarily be nased on the date you were given. There is no reason for you to try to recalculate the Svar column. For the note 2 figures, 2013, season 4: 134 -14.6 = 119.40, etc.