The quality$-$control plan for a certain production process involves taking samples of size $4.$ The results from the last $31\mathrm{.}00$ samples can be summarized as follows:

$31\mathrm{.}00$i$=1$X$$i$=712\mathrm{.}5$

$31\mathrm{.}00$i$=1$Ri$=143\mathrm{.}7$

$31\mathrm{.}00$i$=1$si$=62\mathrm{.}5$

Using the sample standard deviations, compute the $3\backslash$sigma control limits for the X$$

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$($Round the final answer to three decimal places.$)$

The LCL is $16\mathrm{.}934$ Numeric ResponseEdit Unavailable. $16\mathrm{.}934$ incorrect..

The UCL is $29\mathrm{.}032$ Numeric ResponseEdit Unavailable. $29\mathrm{.}032$ incorrect..