Additional Algo $9-1$ Process Capability Index

A milling process has an upper specification of $1\mathrm{.}525$ centimeters and a lower specification of $1\mathrm{.}48$ centimeters. A sample of parts had a mean of $1\mathrm{.}51$ centimeters with a standard deviaiton of $0\mathrm{.}02$ centimeters.

What is the process capability index for this system?

Note: Round your answer to $4$ decimal places.

Capability index