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The true value of a measured quantity is

  • A.never known exactly, only estimated
  • B.the value the instrument indicates on the day
  • C.the average of a large number of readings taken
  • D.the value stamped on the instrument's calibration certificate

Answer: A

Every measurement carries an uncertainty, so the best that can be offered is an estimate with a stated interval around it. Treating the mean of many readings as the truth ignores any systematic error present in all of them.

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