Need Help with Error in Measurment! (1 Viewer)

[LUHGMUFC18]

Ok does anyone get it?
Has anyone studied & WTF is it useful for IMO

 

[deviousgeek]

Kinda tired but aight.


Say you were measuring the length of a table, and it was 140cm, to the nearest cm.

Well, the smallest unit in this case is 1cm, so half of that is the margin of error, so it's 0.5 or .5cm.

What is the maximum and minimum percentage error for this?

Minimum: 139.5cm

Maximum: 140.5cm

Range: 139.5 - 140.5


Percentage Error: (.5 (Half a cm) / 140) x 100 Will give you a % error.

 

[fullonoob]

what it is useful is common sense.
in engineering, which you can apply here, you find the factor of safety (range) which something works in so it doesnt fail.

 

[sammers]

Error measn the difference between the difference between the measured value and the true value.
The precision of a measuring device is the smallest uni marked on that device.
The accuracy of a measuremnt is how correct or true that measurement is.
The absolute error of a measurement is the greatest possible error or 'the furthest by which you can be wrong.' It is equal to half the precision of the measuring device.
The limits of accuracy refer to the upper and lower values between which a measurement can lie.
Percentage error= absolute error divided by measurement times 100%