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When is triangular distribution is used in a Type-B method?

(a) When most values are near the origin

(b) When most values are near the right most position of distribution

(c) When most values are near the left most position of distribution

(d) When most values are near the centre of distribution

I got this question in a national level competition.

My question is based upon Type B Evaluation of Standard Uncertainty topic in portion Evaluating Uncertainty in Measurement of Engineering Metrology

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Right answer is (d) When most values are near the centre of distribution

Easy explanation: Triangular distribution of Type-B evaluation is used when it is known that most of the values used are more likely to be near the centre of the distribution, rather than at the extreme limits.

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