S$6\mathrm{.}43$ The specifications for a plastic liner for concrete highway projects calls for a thickness of $3\mathrm{.}0mm+-\mathrm{.}1mm.$ The standard deviation of the process is estimated to be $\mathrm{.}02mm.$ What are the upper and lower specification limits for this product? The process is known to operate at a mean thickness of $3\mathrm{.}0mm.$ What is the $C_{pk}$ for this process? About what percentage of all units of this liner will meet specifications? PX