The GATE Grind

GATE 2016 ME (ME3) – Question 35

Operations Research · Network flow models, PERT and CPM · 1 mark · Multiple choice

In PERT chart, the activity time distribution is

  1. Normal
  2. Binomial
  3. Poisson
  4. Beta

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Show answer and explanation

Correct answer: (D) Beta

Explanation

Classical PERT models uncertain activity duration by a beta distribution, allowing asymmetry within optimistic and pessimistic bounds. Thus **D**. Its three estimates give expected duration(a+4m+b)/6; normal approximations, when used for a path total, do not change the activity-level assumption.