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''E'' is a [[weighted average]] which takes into account both the most optimistic and most pessimistic estimates provided. SD measures the variability or uncertainty in the estimate.
In Project Evaluation and Review Techniques (PERT) the three values are used to fit a beta distribution for Monte Carlo simulations.
The [[triangular distribution]] is also commonly used. It differs from the double-triangular by its simple triangular shape and the mode does not have to coincide with the median. The mean (expectation) is then:
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