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4. The following table presents the number of defects observed in 7 samples of circuit boards. (a) Set up a c-chart for these data. (b)

4. The following table presents the number of defects observed in 7 samples of circuit boards. (a) Set up a c-chart for these data. (b) Is the process in the statistical control? Why? (10) Sample A B D E F G Number of defects 30 25 33 22 23 45 7

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