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City and Regional Planning QUESTION #4982
Question 1
In PERT analysis, if optimistic time is 5 days, most likely time is 8 days, and pessimistic time is 17 days, what is the expected time?
  • 8 days
  • 9 days✔️
  • 10 days
  • 11 days
Correct Answer Explanation
PERT expected time formula: $t_e = \frac{t_o + 4t_m + t_p}{6} = \frac{5 + 4(8) + 17}{6} = \frac{54}{6} = 9$ days. This beta distribution-based calculation weighs the most likely time more heavily than optimistic/pessimistic estimates.