The specification for a plastic liner for concrete highway projects calls for a thickness of $6\mathrm{.}0+-0\mathrm{.}1$mm$.$ The standard deviation for the process is estimated to be $0\mathrm{.}02$mm$.$ What are the upper and lower specific limits for this product? The process is known to operate at a mean thickness of $6\mathrm{.}03$mm$.$ What is the Cp and Cpk for this process. About what percent of all units of this liner will meet specifications.