Question $35$

The UCL and LCL values from $\backslash (3\backslash$times $2\backslash )$ boards with an average of four knotholes $($defects$)$ per $6-$foot board are:$13\mathrm{.}4$ and $013\mathrm{.}4$ and $-1\mathrm{.}3510$ and $010$ and $-218$ and $0$