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B Uncertainty average

  1. Nov 21, 2016 #1
    I have a set of values I got from measurements, and each of these value has an uncertainty associated to it.

    I compute the average of my values. How can I average the uncertainty associated to my average value ? Do I simply take the average of all uncertainties ?
  2. jcsd
  3. Nov 21, 2016 #2


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    No. This way you do injustice to accurate measurements and you let bad measurements have too much weight.
    There are simple rules for this. The average isn't the best estimate: that is the weighted average.
  4. Nov 21, 2016 #3
    Thank you ! I have just read somewhere that indeed this is more precise and used more often in practice when we have a large set of values for a measurement.
  5. Nov 21, 2016 #4


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    Staff: Mentor

    Loved the Dilbert comic in that link.
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