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relative error

sally9306

New member
Joined
Jan 22, 2010
Messages
2
i couldn't get what is relative error and how can i get it.
The question was ' calculated area of a room is 174.2 square feet and actual area is 149.6. find realative error.'
 

Mrspi

Senior Member
Joined
Dec 17, 2005
Messages
2,128
sally9306 said:
i couldn't get what is relative error and how can i get it.
The question was ' calculated area of a room is 174.2 square feet and actual area is 149.6. find realative error.'

Did you look for a definition of "relative error?" I'm sure it is in your textbook.

This link might help you, too:

http://www.ehow.com/how_4425529_calcula ... error.html

After you've reviewed your text and your notes, and this website, please repost showing us your work.
 

sally9306

New member
Joined
Jan 22, 2010
Messages
2
well, i read that, but i cant get it :(
is relative error = measured area/actual area ?
 

mmm4444bot

Super Moderator
Staff member
Joined
Oct 6, 2005
Messages
10,158
sally9306 said:
well, i read that, but i cant get it Can you form any questions for us about it?

is relative error = measured area/actual area ? Nope.
That reference says, "[Relative error is] defined as the absolute error divided by the true value."

That reference also says, "To compute the absolute error, the difference between measurement and the true value is taken."

In your exercise, the measurement is 174.2 and the true value is 149.6, so their difference is the absolute error.

\(\displaystyle \text{Relative Error} \;=\; \frac{\text{Absolute Error}}{\text{True Value}}\)
 

AngelLovee

New member
Joined
Feb 27, 2011
Messages
1
Here's my problem

measured cube is 2cm actual length 2.1

So i would do 2-2.1 then divide it by 2.1?
 

Denis

Senior Member
Joined
Feb 17, 2004
Messages
1,284
Who you, Angel or Sally?
 
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