Question: What is the upper controllimit (UCL) for a c-chart (using a 3 sigma controllimit) if a total of 180 defects were found over 20 samples?

What is the upper controllimit (UCL) for a c-chart (using a 3 sigma controllimit) if a total of 180 defects were found over 20 samples? a) 3 b) 9 C) 18 d) 20 e) 7.5

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