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Standard deviation

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3(a) Daily samples of 100 power drills are removed from Tec Best's assembly line and inspected for defects. Over the past 21 days the following information contained in Table 1 has been gathered.

i. Develop a 3 standard deviation (99.7%) confidence p chart and graph the samples.
ii. Is the process in control?
iii. If not what do you think can be done?

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