Question: What is the upper control limit for a c-chart if the total defects found over 20 samples equals 150? Using 3-sigma control limits (z=3) a)

What is the upper control limit for a c-chart if the total defects found over 20 samples equals 150? Using 3-sigma control limits (z=3) a) 7.5 b) 2.739 c) 15.72 d) 20 e) 30

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