Find three-sigma control limits and central line for c chart


A c chart is to be used to control soldering imperfections on a certain mass-produced circuit board. After 250 circuit boards have been inspected, a total of 300 bad solder joints were found.

(a) Calculate 3-sigma control limits and the central line for the c chart.

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Basic Statistics: Find three-sigma control limits and central line for c chart
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