a$)$ Express the result of this division in the correct number of significant figures

$\frac{0\mathrm{.}54}{2\mathrm{.}07}=$

b$)$ Express the result of this subtraction in the correct number of significant figures

$5\mathrm{.}67-1\mathrm{.}1-0\mathrm{.}9378=$

the average of the following numbers