# What is the actual definition of expanded uncertainty?

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What is the actual definition of expanded uncertainty?

(a) Uncertainty of the measurement result expressed as a standard deviation

(b) Quantity defining an interval about the measurement result

(c) Evaluation method of uncertainty by the statistical analysis of series of observations

(d) Uncertainty Evaluation method by other than the statistical analysis

I got this question in quiz.

Enquiry is from Expanded Uncertainty topic in chapter Evaluating Uncertainty in Measurement of Engineering Metrology

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The correct answer is (b) Quantity defining an interval about the measurement result

The explanation is: The quantity that defines an interval about the measurement outcome which can be expected to include a large portion of the distribution of values that could be attributed to the measurand.

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