Railways Technical Ability Metrology and Inspection Question Bank Metrology and Inspection

  • question_answer A control chart is established with limits of \[\pm \,2\] standard errors for use in monitoring samples of size \[n=20.\] Assume the process to be in control. What is the likelihood of a sample mean falling outside the control limits?

    A) 97.7%              

    B) 95.3%

    C) 4.5%                

    D) 23%

    Correct Answer: B


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