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Standard deviation

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?

(See attachment for rest0

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