A customer has given you specification limits of $(23\mathrm{.}5,32\mathrm{.}5).$ Your normally

distributed process has $\backslash$sigma $=1.$ The $3-$sigma control chart is in$-$control and

centered with limits $(26\mathrm{.}5,29\mathrm{.}5).($a$)$ What sample size are you using?