# When is rectangular distribution is used in Type-B evaluation method?

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When is rectangular distribution is used in Type-B evaluation method?

(a) When value of measurand is equal to upper limit

(b) When value of measurand is equal to lower limit

(c) When measurand lies anywhere within the limits

(d) When no limits can be determined

I had been asked this question by my college director while I was bunking the class.

This is a very interesting question from Type B Evaluation of Standard Uncertainty in division Evaluating Uncertainty in Measurement of Engineering Metrology

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Correct option is (c) When measurand lies anywhere within the limits

The explanation is: Rectangular distribution is used when the limits can be determined and the value of the measurand is equally likely to lie anywhere within the limits.

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