Please help me answer this question with detailed steps and answers, preferably done on a computer. If handwriting is required, please do not use cursive script

Question $1(3+3$ points$)$

A quality control inspector has taken $4$ samples with five observations each, measuring the volume of chips per bag. If the average range for the fours samples is $0\mathrm{.}6$ ounce and the grand mean of the observations is $15$ ounces, find the control limits for X$-$bar and R$-$charts. $(3$pts$,3$pts$)$