An $/-$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 $2006.$ The value

of Cpm is therefore estimated as:

O a$.$

$1\mathrm{.}382$

O b$.1\mathrm{.}923$

O c$.1\mathrm{.}082$

O d$.3\mathrm{.}696$

O e$.0\mathrm{.}586$