Given the following process control data for a normally distributed quality variable $($three samples of size four each$)$:

If the process was unstable, then adjusted and declared stable before these measurements were taken, what is an estimate of the process mean, and the control limits $($UCL & LCL$)?$f the process was unstable, then adjusted and declared stable before these measurements were taken, what is an estimate of the process mean, and the control limits $($UCL & LCL$)?$

Group of answer choices

$14,15\mathrm{.}11$ & $12\mathrm{.}81$

$18,19\mathrm{.}11$ & $16\mathrm{.}81$

$17\mathrm{.}5,20\mathrm{.}17$ & $14\mathrm{.}83$

$16,17\mathrm{.}95$ & $14\mathrm{.}05$