QUESTION $16$Using the table below calculate UCL and LL for a mean chart. Assume the standard deviation is unknown. Round to $1$ decimal$\mathrm{.}12\mathrm{.}312\mathrm{.}212\mathrm{.}1211\mathrm{.}912\mathrm{.}212\mathrm{.}2312\mathrm{.}012\mathrm{.}211\mathrm{.}8412\mathrm{.}111\mathrm{.}811\mathrm{.}82$ point a$.$ UCL$=12\mathrm{.}4,$ LCL$=0$ b$.$ UCL$=11\mathrm{.}7,$ LCL$=0$O c$.$ UCL$=12\mathrm{.}4,$ LCL$=11\mathrm{.}7$ d$.$ UCL$=11\mathrm{.}7,$ LCL$=12\mathrm{.}4$ e$.$ Cannot be determined