An I$-$MR chart is established for an in$-$control process with X$-$bar $=199,$ MR $=3\mathrm{.}2,$ and span $=4.$ Specifications on

the normally distributed quality characteristic are set at $200\backslash$pm $5.$ The value of Cpi is therefore estimated as:

O a$.0\mathrm{.}98$

O b$.1\mathrm{.}08$

O c$.1\mathrm{.}37$

d$.0\mathrm{.}92$

e$.0\mathrm{.}78$