Discussion
Rounding a result to fewer figures than the uncertainty warrants
Answer: C
Correct answer: throws away information the measurement actually contains
Over-rounding is as much a fault as quoting spurious figures, though a less conspicuous one. If the uncertainty is 0.02 then quoting 12.3 discards a digit the measurement genuinely determined. The convention is to round the uncertainty to one or two significant figures and match the result to the same decimal place.
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