Absolute & relative uncertainty

  1. how do i find the absalute uncertainty for the following
    82.5+/-5.2%
    679800+/-0.19%
    0.0079+/-8.1%
    420+/-23%
    calculate the relative uncertainty for the following
    1. 2.75 0.06
    2. 714 8
    3. .0031 0.0008
    4. 204000 5000
    5. 1.78 x 10-3 6 x 10-5
    my answers
    1. 2%
    2. 1.12%
    3. 2.5%
    4. 2.4%
    5. 3.4%
     
  2. jcsd
  3. OlderDan

    OlderDan 3,030
    Science Advisor
    Homework Helper

    I assume there is a ± between the numbers in the second set of 5. #3 is incorrect. For #1, I would think you might keep another decimal place or two as you did for the others.

    Finding absolute uncertainty from % uncertainty is the reverse process that you used for finding % from absolute. What is 5.2% of 82.5?
     
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