It is required to establish Upper and Lower Quality Control limits on the weight of a semolina product produced in a Flour Mills Factory. $12$ samples of size $5$ are taken and the following Average Weight values $($grams$)$ as well as Range values $($Maximum$-$Minimum$)$ are determined for each sample.

xi: $72\mathrm{.}574\mathrm{.}075\mathrm{.}572\mathrm{.}574\mathrm{.}272\mathrm{.}573\mathrm{.}272\mathrm{.}273\mathrm{.}074\mathrm{.}274\mathrm{.}773\mathrm{.}5$

Ri: $3\mathrm{.}04\mathrm{.}03\mathrm{.}03\mathrm{.}52\mathrm{.}53\mathrm{.}04\mathrm{.}03\mathrm{.}02\mathrm{.}52\mathrm{.}02\mathrm{.}53\mathrm{.}0$

a$)$ Establish $3\backslash$sigma x control limits for x and R charts to be used for future process control. $($Note: Delete the points that are out of control limits and reestablish the limits$)$