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Annualized rate of occurrence (ARO) is described as an estimated frequency of the threat occurring in one year. ARO is used to calculate ALE (annualized loss expectancy). ALE is calculated as follows: ALE = SLE x ARO. ALE is $15,000 ($30,000 x 0.5), when ARO is estimated to be 0.5 (once in two years).Click to see full answer. Similarly, it is asked, what is the formula used to compute ale?The annualized loss expectancy (ALE) is computed as the product of the asset value (AV) times the exposure factor (EF) times the annualized rate of occurrence (ARO). This is the longer form of the formula ALE = SLE x ARO.Likewise, how is SLE calculated? SLE is the starting point to determine the single loss that would occur if a specific item occurred. The formula for the SLE is: SLE = asset value × exposure factor . While the SLE is a valuable starting point it only represents the single loss an organization would suffer. Also to know is, what is ale in security? The annualized loss expectancy (ALE) is the product of the annual rate of occurrence (ARO) and the single loss expectancy (SLE). It is mathematically expressed as: Suppose that an asset is valued at $100,000, and the Exposure Factor (EF) for this asset is 25%.What are the basic formulas used in quantitative risk assessment? A quantitative risk assessment measures the risk using a specific monetary amount. Any of these are valid: ALE = SLE × ARO. ARO = ALE / SLE. SLE = ALE / ARO.

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