Question $1$

Table $5\mathrm{.}4$

$4$ ots

The manager of Champion Cooling Company has recently implemented a statistical process control method. The accompaning table shows the recorded temperatures of five different samples of walk$-$in coolers that were produced in the previous month.

$\backslash$table$[[,$Sample $1,$Sample $2,$Sample $3,$Sample $4,$Sample $5],[$Unit $1,104\mathrm{.}0,100\mathrm{.}1,101\mathrm{.}1,102\mathrm{.}0,102\mathrm{.}7],[$Unit $2,106\mathrm{.}4,104\mathrm{.}4,100\mathrm{.}4,105\mathrm{.}9,105\mathrm{.}4],[$Unit $3,101\mathrm{.}8,103\mathrm{.}6,103\mathrm{.}0,104\mathrm{.}6,106\mathrm{.}1],[$Unit $4,105\mathrm{.}6,101\mathrm{.}4,101\mathrm{.}0,102\mathrm{.}1,102\mathrm{.}5],[$Unit $5,100\mathrm{.}6,100\mathrm{.}7,104\mathrm{.}9,107\mathrm{.}0,102\mathrm{.}0]]$

Use the information in Table $5\mathrm{.}4.$ The center line of the R$-$chart is:

$4\mathrm{.}8.$

$5\mathrm{.}9$

$3\mathrm{.}9$

$4\mathrm{.}4.$