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Could it be the multiplier is set to be 1 (different from the usual 3 though), so

LCL = 12 – 1 × [0.3/√8] ≈ 12 – 0.11 =11.89

UCL = 12 + 1 × [0.3/√8] ≈ 12 + 0.11 =12.11

Please do let me know the teacher’s explanation. Thanks!

 

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