Question: Suppose that a firm was using an X - bar chart for one of their processes. To the closest integer, the lower control limit was

Suppose that a firm was using an X-bar chart for one of their processes. To the closest integer, the lower control limit was 24, the upper control limit was 26, the lower natural tolerance was 23, and the upper natural tolerance was 27. The firm's prime customer has indicated that they want product that measures anywhere from 20 to 30. Compute the process capability index.

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