process capable of achieving four$-$sigma performance $($the four$-$sigma performance largel value is $1\mathrm{.}33)?4)$ CPk $1\mathrm{.}25,$ CP $1\mathrm{.}67,$ Four sigma performance can be met with regards to variability but work must be done on the process to improve centering in order to achieve four sigma process performance.B$)$ CPk is $1\mathrm{.}5$ and CP is $1\mathrm{.}75$; four sigma can be met for variability and centering.