Annualized Rate of Occurrence (ARO) Calculation
Question
What would be the Annualized Rate of Occurrence (ARO) of the threat "user input error", in the case where a company employs 100 data entry clerks and every one of them makes one input error each month?
Answers
Explanations
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A. B. C. D.D.
If every one of the 100 clerks makes 1 error 12 times per year, it makes a total of 1200 errors.
The Annnualized Rate of Occurence (ARO) is a value that represents the estimated frequency in which a threat is expected to occur.
The range can be from 0.0 to a large number.
Having an average of 1200 errors per year means an ARO of 1200
The Annualized Rate of Occurrence (ARO) is a metric used in risk assessment to estimate the expected frequency of an event occurring in a given year. It is calculated by dividing the total number of events that could occur in a year by the total number of opportunities for the event to occur.
In this case, the threat is "user input error", and the scenario is that 100 data entry clerks make one input error each month. So the total number of opportunities for the error to occur in a year is:
100 clerks * 12 months = 1200 opportunities per year
To calculate the total number of events (input errors) that could occur in a year, we need to multiply the number of opportunities by the probability of the event occurring in each opportunity.
The probability of an input error occurring in each opportunity is 1 error per 1 opportunity, since every clerk is making one error per month. So the total number of events that could occur in a year is:
1200 opportunities * 1 error per opportunity = 1200 errors per year
Therefore, the Annualized Rate of Occurrence (ARO) for the threat "user input error" in this scenario is D. 1200.
