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Which reliability metric sets out the probable number of system failures that are likely to be observed relative to a certain time period?

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Which reliability metric sets out the probable number of system failures that are likely to be observed relative to a certain time period?

(a) POFOD

(b) ROCOF

(c) AVAIL

(d) None of the mentioned

I got this question in quiz.

This question is from Dependability and Security Specification in chapter Dependability and Security of Software Engineering

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The correct option is (b) ROCOF

For explanation I would say: Rate of occurrence of failures (ROCOF) sets out the probable number of system failures that are likely to be observed relative to the number of system executions.

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