Chapter 4 - Section 4.7 - Relative Error and Percent of Error - Exercise - Page 191: 8

0.1 g, 0.05 g, 0.0227, 2.27%

For the measurement 2.2 g, we have The precision is 0.1 g The greatest possible error is one-half the precision $0.5\cdot 0.1\ g=0.05 \ g$ The relative error is $relative~error=\dfrac{greatest~possible~error}{measurement}$ $\frac{0.05\ g}{2.2\ g}=0.227$ The percent of error is $2.27\%$