Using x$-$bar chart control limits of UCL$=530$ and LCL$=470,$ which of the two samples presented in the table below, should be determined to be out$-$of$-$control $($hint: use the appropriate sample statistic$)?$

Sample

Sampled Items' Service Life $($hours$)$

$1$

$490$

$500$

$540$

$2$

$460$

$530$

$480$

Question $5$ options:

Sample $2$

Samples $1$ & $2($both$)$

Sample $1$

Neither