Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Percentage error

  1. Aug 16, 2010 #1
    1. The problem statement, all variables and given/known data

    the frequency squared is 106.01 k^2 Hz^2. The percentage error is 10 %. How do you quote the quantity

    2. Relevant equations

    I said (106.0 +/- 10.6) k^2 Hz^2

    My question is rounding to (106 +/- 11) k^2 Hz^2 wrong? 11 k^2 Hz^2 seems to be more than 10 per cent. Thanks

    3. The attempt at a solution
  2. jcsd
  3. Aug 17, 2010 #2


    User Avatar
    Homework Helper

    Well, it's not much of a difference between 10.6% and 11%. In the real world, you'd probably write 106 ± 11 because giving more than two significant figures in the error is pretty useless.

    But if this is a problem for a class... I couldn't guarantee that 106 ± 11 would be accepted as correct. Sometimes the rules used for grading homework problems don't quite correspond to real life. (Often for good reason, but sometimes not)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook