error and percent error

• Oct 30th 2009, 09:57 AM
LivinLife
error and percent error
Ugh, greatest possible error and percent error is not my best friend.

How do I solve these problems...Ive never covered this stuff in school.
• Oct 30th 2009, 10:23 AM
masters
Quote:

Originally Posted by LivinLife
Ugh, greatest possible error and percent error is not my best friend.

How do I solve these problems...Ive never covered this stuff in school.

Hi LivinLife,

What problems? I don't see any.

The Greatest Possible Error of a measurement is one half of the unit of measure to which the measure is being rounded.

Example: If you are measuring a length using inches, the greatest possible error would be 1/2 inch. If you measured in meters, the greatest possible error would be 50 cm (1/2 meter).

Per Cent Error = $\frac{\text{Observed value - True Value}}{\text{True Value}} \times 100$
• Oct 30th 2009, 10:27 AM
LivinLife
Quote:

Originally Posted by masters
Hi LivinLife,

What problems? I don't see any.

The Greatest Possible Error of a measurement is one half of the unit of measure to which the measure is being rounded.

Example: If you are measuring a length using inches, the greatest possible error would be 1/2 inch. If you measured in meters, the greatest possible error would be 50 cm (1/2 meter).

Per Cent Error = $\frac{\text{Observed value - True Value}}{\text{True Value}} \times 100$

haha sorry...
um the questions im trying to figure out are:

Find the greatest possible error for the measurement 0.991g
Find the percent error for 2cm (round to the nearest hundredth)