The results from a compaction test are shown below

$\backslash$table$[[$Water Content, $\%,7\mathrm{.}0,11\mathrm{.}8,9\mathrm{.}6,12\mathrm{.}9,15\mathrm{.}3],[$Dry unit weight, pcf$,123\mathrm{.}9,131\mathrm{.}7,132\mathrm{.}0,128\mathrm{.}8,125\mathrm{.}1]]$

Find the maximum dry density. Find the optimum water content $($water content at which maximum dry density happens$).$