$3.$ The time in minutes to replace vehicle wiper blades at a service center was monitored using a mean$$and a range chart. Six samples of n $=20$ observations were obtained and the sample means and$$ranges were computed:$$Sample Mean Range Sample Mean Range$13\mathrm{.}06\mathrm{.}4243\mathrm{.}13\mathrm{.}4623\mathrm{.}15\mathrm{.}5053\mathrm{.}06\mathrm{.}4633\mathrm{.}11\mathrm{.}4163\mathrm{.}09\mathrm{.}45$a$.$ Using the factors in Table $10\mathrm{.}3,$ determine upper and lower limits for mean and range charts.$$Is the process within the control limits$?$b$.$ The time in minutes needed to assemble security cameras at a production facility was recorded for$$eight samples of $15$ observations each, and means and ranges were computed. Using factors from$$Table $10\mathrm{.}3,$ compute control limits for the means and ranges to determine if the process is in control.