A production manager at a Contour Manufacturing plant has inspected the number of defective plastic molds in five random samples

of $10$ ?observations each. Following are the number of defective molds found in each sample:

Construct a $3-$ sigma control chart $(z=3)$ ?with this information. $($ If the lower control limit is negative, round the LCL to zero and all other

answers to $2$ ?decimal places, e $.$ g $.15\mathrm{.}25.)$

$CL$

UCL