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Which distribution is related to U-probability distribution of Type-B evaluation of uncertainty?

(a) Arcsin distribution

(b) Binomial distribution

(c) Poisson distribution

(d) Bernoulli distribution

I have been asked this question during an internship interview.

I would like to ask this question from Type B Evaluation of Standard Uncertainty in section Evaluating Uncertainty in Measurement of Engineering Metrology

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The correct option is (a) Arcsin distribution

The explanation: U-probability distribution of Type-B evaluation method of uncertainty is used when the values are at extreme limits and values are least at mean for example Arcsin distribution. Standard uncertainty = a/√2.

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