The greatest possible error in a measurement is the greatest number which is allowed for approximation assuming the number is obtained by approximation.
The greatest possible error is usually half of the place value of the last digit of the number.
Given the measurement of
oz.
This is equivalent to 11.125 oz.
The place value of the last digit (i.e. 5), is thousandth or 0.001
Therefore, the greatest possible error of
oz is 0.001 / 2 = 0.0005 oz