The mean processing time $(\stackrel{}{x})$ of a job on a machine is $11$ minutes with a standard deviation $()$ of $0\mathrm{.}23$ minutes. Upper specification limit $(USL)$ is $11\mathrm{.}5$ minutes, whereas lower specification limit $(LSL)$ is $10\mathrm{.}5$ minutes. What is the process capability ratio $(c_p)$ for this process? Is the process capable?

$Cp=0\mathrm{.}72,$ capable

$Cp=1\mathrm{.}5,$ capable

$Cp=1,$ not capable

$Cp=0\mathrm{.}72,$ not capable

$Cp=1,$ capable