Ppk = Minimum of (USL Process Capability, LSL Process Capability)
(Please search for Ppk formula online to see the actual formula)
Since we are given the spread of 24 and not the standard deviation, we will need to divide 24/2. If we were given the standard deviation, then in the denominator, we would have multiplied "3Sigma" with the "standard deviation" to find the "USL Process Capability" and the "LSL Process Capability".
USL Process Capability = 82 - 68 / 12 = 1.166 = rounded to 1.17.
LSL Process Capability = 68 - 54 / 12 = 1.166 = rounded to 1.17.
The correct answer is supposed to be 1.17, which is none of those.
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