ork $4\mathrm{.}4$

Question $19,4\mathrm{.}4\mathrm{.}8$

Find the average value over the given interval.

$f(x)=x^{2}x-3$;$[0,6]$

The average value of $f(x)=x^{2}x-3$ on $0,6$ is $$

$($Type an integer or a simplified fraction.$)$