Determine the intervals $on$ which the function $is$ concave $upor$ down and find the points $of$ inflection.

$f(x)=8x^3-11x^2+5$

$(Give$ your answer $as$ a comma$-$separated list $of$ points $in$ the form $(*,*).$ Express numbers $in$ exact form. Use symbolic notation

and fractions where needed.$)$