Mathematics · Statistical Quality Control
Consider a manufacturing process for coils where samples of size n = 5 are randomly selected. For 25 samples, the sum of the sample means (∑x̄) is 521 and the sum of the sample ranges (∑R) is 87. Given the control chart factor A2 = 0.577 for n = 5, determine the trial control limits (UCL and LCL) for the x̄ chart.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1UCL = 20.24 and LCL = 15.12
- 2UCL = 18.34 and LCL = 14.67
- 3UCL = 22.848 and LCL = 18.832✓
- 4UCL = 20.24 and LCL = 18.832
Correct answer
UCL = 22.848 and LCL = 18.832
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