# You measure a piece of rope and find its length to be 12 m. How do you find the percent error of this measurement?

##### 1 Answer

Aug 27, 2017

You can only do so by knowing its actual length, which you have not provided.

And if we somehow already know the true length to be **percent error** would be:

#barul|stackrel(" ")(" "%"error" = (|"measured" - "true value"|)/("true value") xx 100%" ")|#

And with your *measured*

#= (|12 - 12.2|)/(12.2) xx 100%#

#= 1.64%#

Given the measurement was made to two significant figures, the difference was