The quality$-$control plan for a certain production process involves taking samples of size $4.$ The results from the last $29\mathrm{.}00$ samples can be summarized as follows:

$29\mathrm{.}00$i$=1$X$$i$=712\mathrm{.}5$

$29\mathrm{.}00$i$=1$Ri$=143\mathrm{.}729\mathrm{.}00$i$=1$si$=62\mathrm{.}5$

Compute the $3\backslash$sigma control limits for the R chart. $($Round the final answer to three decimal places.$)$

The LCL is $.$

The UCL is $.$