The density of air is $1\mathrm{.}29$ grams$/$Litre$.$ What is the weight, in kilograms, of a cubic metre $(1\mathrm{.}00m^3)$ of air?

In the literature, the density of a specific mineral is listed as $3\mathrm{.}845$gram$\frac{s}{c}{m}^3.$ A student determined its density to be $3\mathrm{.}644$gram$\frac{s}{c}{m}^3.$ Determine the student's percent error.