Chapter 4 - Section 4.7 - Relative Error and Percent of Error - Exercise - Page 191: 7

1 g, 0.5 g, 0.25, 25%

For the measurement 2 g, we have The precision is 1 g The greatest possible error is one-half the precision $0.5\cdot 1\ g=0.5 \ g$ The relative error is $relative~error=\dfrac{greatest~possible~error}{measurement}$ $\frac{0.5\ g}{2\ g}=0.25$ The percent of error is $0.25\%$