A critical device has a mount whole specified between $3\mathrm{.}0$ millimeters and $3\mathrm{.}3$ millimeters $($as design specification$).$ From a sample manufacturing data, it obtained

Grand mean $=3\mathrm{.}1$ millimeter

Standard deviation, $\backslash$sigma $=0\mathrm{.}05$ millimeter.

Find the Process Capability ratio, Cp

Cp $=1\mathrm{.}0$

Cp $=1\mathrm{.}2$

Cp $=1\mathrm{.}66$

Cp $=2\mathrm{.}0$