Answer:
The Cpk for the process is 1.61
Explanation:
The formula for Cpk is:

In this case in specific that we can test the capability of the process for 2 standard dev we modify the formula to adjust it:
so for this formula:
average: 23.546
USL: 23.23+0.612=23.842
LSL: 23.23-0.612=22.618
standard dev=0.092
So,
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The Cpk for the process is 1.61, so is a good indicator even with the control of two standard dev.