$4$

$7\mathrm{.}54$

$\mathrm{.}51$

$4.$ Software upgrade times $($in minutes$)$ are being factors from Table $\frac{10.}{b}ar(3),$ determine upper and lower been taken, and the results are as listed. Using fecide if the process is in control. control limits for mean and range SAMPLE

$\backslash$table$[[$SAMPLE$],[1,2,3,4,5,6,],[79\mathrm{.}2,80\mathrm{.}5,79\mathrm{.}6,78\mathrm{.}9,80\mathrm{.}5,79\mathrm{.}7,],[78\mathrm{.}8,78\mathrm{.}7,79\mathrm{.}6,79\mathrm{.}4,79\mathrm{.}6,80\mathrm{.}6,],[80\mathrm{.}0,81\mathrm{.}0,80\mathrm{.}4,79\mathrm{.}7,80\mathrm{.}4,80\mathrm{.}5,],[78\mathrm{.}4,80\mathrm{.}4,80\mathrm{.}3,79\mathrm{.}4,80\mathrm{.}8,80\mathrm{.}0,],[10\mathrm{.}6,80\mathrm{.}1,80\mathrm{.}8,80\mathrm{.}6,78\mathrm{.}8,81\mathrm{.}1,]]$