Data from a $6-$ft by $6-$ft inductive loop detector collected during a time period of $21$ sec indicate that the mean speed of traffic is $45$ mi$/$h among the $17$ vehicles counted. Assume an average vehicle length of $19ft.$ Determine the density $($in veh $\frac{?}{mi})$ and occupancy $($percentage$).$

density

$64\mathrm{.}76190$

$ve\frac{h}{m}i$

occupancy

$\%$

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