SinIV:$r$

Time left $1$:$10$:$40$

$37$

A metal$-$cutting operation has a target value of $20$ and consistently averages $19\mathrm{.}8$ with a standard deviation of $0\mathrm{.}5.$ The design engineers have established an upper specification limit of $22$ and a lower specification limit of $18.$ Which statement concerning this process is true?

Select one:

A$.$ The process capability ratio is $1\mathrm{.}46.$

B$.$ The process capability index is $1\mathrm{.}33.$

C$.$ The process is in control.

D$.$ None of these is true.

$tan38$

The UCL and LCL for an $\stackrel{}{x}$ chart are $25$ and $15$ respectively. The central line is