Question: A control chart is to be established on a process producing refrigerators. The inspection unit is one refrigerator, and a common chart for nonconformities is

A control chart is to be established on a process producing refrigerators. The inspection unit is one refrigerator, and a common chart for nonconformities is to be used. As preliminary data, 32 nonconformities were counted in inspecting 50 refrigerators. Samples on the control limits are regarded in-control

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