Answer
a. $10,000~V$
b. $ 5000 \ V.$
Work Step by Step
For the measurement $13,0\bar{0}0,000\ V$, we have
a. The precision is $10,000~V$ (notice that the $\bar{0}$ is in the $10,000$ place).
b. The greatest possible error is one-half the precision:
$$0.5\cdot 10,000 \ V= 5000 \ V.$$
