$($a$)$ Calculate the overall proportion of "tourists" $($cars with out$-$of$-$state plates$)$ and the standard deviation of proportions.

$($b$)$ Using a $99\mathrm{.}73\%$ confidence, calculate the LCL and UCL for these data.

$($c$)$ Draw the control chart?

$($d$)$ Is the process under control? Explain why.

$($e$)$ What type of variation is present?