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Calculating average error

  1. Oct 12, 2009 #1

    I was just wondering how you calculate the average error, is there a certain formula?


    Three landing distances were measured and they were

    6.93 cm +/- 0.05cm
    6.56 cm +/- 0.05cm
    6.65 cm +/- 0.05cm

    To calculate error, do you add the landing distances then divide them by three and then add the errors for each one, therefore the average would be 6.71cm +/- 0.2cm (actual is 0.15cm however error is always in one significant figure) or do you divide the averages by three also, therefore get 6.71cm +/- 0.05cm?
  2. jcsd
  3. Oct 12, 2009 #2


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    Last edited by a moderator: Apr 24, 2017
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