A.) Deliver them to the customer.
B.) Don’t’ deliver them to the customer.
C.) The process is out of control and needs to be adjusted.
D.) You should not be inspecting because you have clear control and specification limits.
Since the upper specification limit provided by the Customer is 15.2 cm , the last aluminium dowels produced with 15.2 cm long have no problem with Customer's specification limit. So it can be delivered without any hesitation.
As per PMBOK 5
A process is considered out of control when: (1) a data point exceeds a control limit; (2) seven consecutive plot points are above the mean; or (3) seven consecutive plot points are below the mean
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