# If calibration certificate state the uncertainty at Xσ (X is numerical value) and quoted uncertainty is N, then what is the value of standard uncertainty?

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If calibration certificate state the uncertainty at Xσ (X is numerical value) and quoted uncertainty is N, then what is the value of standard uncertainty?

(a) X*N

(b) X/N

(c) N/X

(d) N^X

The question was posed to me in an online interview.

My question is taken from Type B Evaluation of Standard Uncertainty topic in section Evaluating Uncertainty in Measurement of Engineering Metrology

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The correct option is (c) N/X

The best explanation: The standard uncertainty will be obtained by dividing the given value by the multiple. For example, if a calibration certificate states the uncertainty at 5a, the standard uncertainty is then simply, quoted uncertainty/5.

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