Estimate process capability using the x and R charts for the power supply voltage data in Exercise

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Estimate process capability using the x and R charts for the power supply voltage data in Exercise 6.8 (note that early printings of the 7th edition indicate Exercise 6.2). If specifications are at 350 ± 50 V, calculate Cp, Cpk, and Cpkm. Interpret these capability ratios.
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