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Twenty samples were taken from a cable-weaving machine while it was being operated under closely controlled...

Twenty samples were taken from a cable-weaving machine while it was being operated under closely controlled conditions. The number of defects per 100 meters for the samples is recorded below: 4, 4, 5, 3, 6, 2, 2, 4, 5, 3, 4, 2, 3, 2, 4, 5, 5, 7, 5, 3. Determine 3? control limits for monitoring defects of the process.

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