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accuracy of answers

A

Actuary

Member
I'm happy that it's sensible to stay as accurate as possible throughout a question, but when giving an answer is there a rule to stick to? like 3 s.f. or something? Working through past exam papers the answers always vary in accuracy, but i haven't spotted a pattern! Will i be penalised for too many sig figs in answer? is it acceptable to leave answers as surds, or eg exp(22/30)?

cheers
 
Hi,

I personally don't think it matters how you write them down, I usually write them down as fractions if possible, but I'll work out the exp(-0.1).

Then i'll write down an answer to quite a few significant figures, then write down a rounded version too as my "final" answer, for example

14.568779 = £14.57

If using the tables for annuities (which I suggest just to get used to the beast thats CT5), then any answers I wouldn't quote to more decimal places than how many are qouted in the tables, if you use 14.5076 for an annuity value, then quoting the answer to full calculator digits would be daft
 
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