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Calculate the Expected Value for the Software size

What is the process to calculate the ‘Expected Value’ for the Software size?

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Expected value for the estimation variable (size), S, can be calculated as the Weighted Average of the Optimistic (or Sopt), most likely (or Sm) and Pessimistic (or Spess) estimates.

S = (Sopt + 4Sm + Spess)/6

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