Process time at a workstation is monitored using sample mean and range control charts. Six samples of n $=12$ observations have been obtained and the sample means and ranges computed $($in minutes$)$:

Sample Mean Range

$13\mathrm{.}120\mathrm{.}50$

$23\mathrm{.}210\mathrm{.}41$

$33\mathrm{.}120\mathrm{.}44$

$43\mathrm{.}050\mathrm{.}54$

$53\mathrm{.}050\mathrm{.}52$

$63\mathrm{.}130\mathrm{.}55$

a$.$ Using the factors in Table $10-3,$ determine the upper and lower limits for sample mean and range control charts. $($Round the intermediate calculations to $2$ decimal places. Round the final mean answers to $2$ decimal places. Round the final range answers to $3$ decimal places.$)$

UCL LCL

Mean $3\mathrm{.}4$ Numeric Response $1.$Edit Unavailable. $3\mathrm{.}4$ incorrect. $2\mathrm{.}83$ Numeric Response $2.$Edit Unavailable. $2\mathrm{.}83$ incorrect.

Range $1\mathrm{.}040$ Numeric Response $3.$Edit Unavailable. $1\mathrm{.}040$ incorrect. $0\mathrm{.}000$ Numeric Response $4.$Edit Unavailable. $0\mathrm{.}000$ incorrect.

b$.$ Is the process in control?

multiple choice

Yes Correct

No