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Homework Help: I really can't understand uncertainty

  1. Sep 24, 2009 #1
    I really can't understand "uncertainty"

    Hi guys,
    I really can't understand "uncertainty"...
    How it works, and Why it works
    I don't understand..
    Like why:
    4+/-0.5 x 5.2+/- 0.2
    =4x5.2 +/- 0.5 x 0.2?

    Would anyone be kind enough to elaborate a bit for me?
    Thanks for reading
    Last edited by a moderator: Jan 7, 2014
  2. jcsd
  3. Sep 24, 2009 #2
    Re: Uncertainty

    Why moved it here?
    It is not homework, not coursework either That was just an example....
    If any naive post will be moved, then who will ask questions here?
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