The Student Room Group

Rounding in A-Level Maths

I do OCR A-Level Maths and i was always under the impression that we round final answers to 3 significant figures, yet i have come across questions in binomial hypothesis testing where they are rounding values to 4 decimal places (for example 0.0082812... is rounded to 0.0083 but i r ounded to 0.00828) and there is no mention in the mark schemes of accepting answers rounded in a different way.

I'm just confused about whether there is a general rule for rounding and if maybe the rule changes when you get smaller numbers?
Reply 1
I usually round to 4dp or 4sf for stats/probabilities (binomial, poison, geometric etc), but 3sf for anything else (unless the question asks for something specific).
Original post by sppm726
I usually round to 4dp or 4sf for stats/probabilities (binomial, poison, geometric etc), but 3sf for anything else (unless the question asks for something specific).

Where did you find out to round to 4 decimal places for stats?

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