A key joint in a precision machining process has a lower specification limit of a width of $0\mathrm{.}93$ mm and an upper specification limit of $1\mathrm{.}07$ mm $.$ The standard

deviation is $0\mathrm{.}02$ mm and the mean is $1$ mm $.$

What is the process capability index for the precision machining process? $($round off your answer to the second decimal place$)$

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