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Significant figures in a reported result should be chosen so that

  • A.the last figure quoted is the first uncertain one
  • B.as many figures as the display offers are always given
  • C.the result is rounded to the nearest whole number
  • D.the number of figures matches the instrument's range

Answer: A

One or two figures in the uncertainty and a result rounded to the same decimal place is the convention, which conveys the resolution honestly. Quoting six figures against a one per cent uncertainty misrepresents the measurement as badly as rounding away real information.

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