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Homework Help: Sig fig or decimal places for variance?

  1. Oct 1, 2012 #1
    1. The problem statement, all variables and given/known data

    Calculate variance of 34.1, 35.6, 35.8, 34.3, 32.9, 33.7


    2. Relevant equations



    3. The attempt at a solution

    A set of numbers: 34.1, 35.6, 35.8, 34.3, 32.9, 33.7

    I have calculated the variance to be = 0.208

    Would it be better to quote to three sig fig as I have done. This being the number of sig fig of the numbers in the set.

    Or should I quote it as 0.2, this being the same number of decimal places of the numbers in the set.

    Thanks
     
  2. jcsd
  3. Oct 1, 2012 #2

    jedishrfu

    Staff: Mentor

    here's a reference to help:

    http://www.usca.edu/chemistry/genchem/sigfig2.htm [Broken]

    from it I'd conclude that 0.208 is the better answer.
     
    Last edited by a moderator: May 6, 2017
  4. Oct 1, 2012 #3
    Thanks very much for the link jedishrfu
     
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