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If the for a fraction nonconforming chart, the probability of a sample point plotting out of control is 0.0531, what will be the ARL for this?

If the for a fraction nonconforming chart, the probability of a sample point plotting out of control is 0.0531, what will be the ARL for this? Correct Answer 18.83

The fraction nonconforming chart which has the probability of a sample point plotting out of control as p, the ARL is given by, ARL = 1⁄p Putting p=0.0531, ARL=18.83.

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