If USL = 550, LSL = 540, μ = 545, and σ = 0.4, the process is highly capable.

Name: If USL = 550, LSL = 540, μ = 545, and σ = 0.4, the process is highly capable.
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Quizplus · Accepted Answer

The process capability index (Cpk) can be calculated as (USL-μ)/(3σ) and (μ-LSL)/(3σ). 
Cpk for upper limit = (550-545)/(3*0.4) = 1.25
Cpk for lower limit = (545-540)/(3*0.4) = 1.25
Since both Cpk values are greater than 1, the process is highly capable. Therefore, the answer is A.