The Pacific Fruit Company has designed its packaging process for boxes to hold a net weight $($nominal value$)$ of $9\mathrm{.}0$ oz$.$ of raisins with

tolerances of $+-0\mathrm{.}5$ oz$.$ Given a process mean of $9\mathrm{.}00,$ an average range of $0\mathrm{.}57$ and a UCL of $1\mathrm{.}21$ and a LCL of $0,$ compute the process

capability ratio and index.