Answer
precision $\frac{1}{4}$ yd
GPE $\frac{1}{8}$ yd
Work Step by Step
The smallest unit is $\frac{1}{4}$ inch, so that is the precision.
Greatest possible error is half the precision.
$GPE=\frac{1}{2}\times\frac{1}{4}=\frac{1}{8}$
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