Question: Based on the historical data, standard deviation of the teller service process was found to be 1.5 minutes. Process mean is calculated as 3.8 minutes.

Based on the historical data, standard deviation of the teller service process was found to be 1.5 minutes.

Process mean is calculated as 3.8 minutes. If service time specifications are respectively 5 and 2 minutes, what is the process capability ratio (Ck) and is process capable?

Show your solution for Cpk.
What does the pk you found say about the capability of the process with respect to spec limits?

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