Question

In PERT, how much probability is considered for expected activity duration?
1. 33%
2. 50%
3. 67%
4. 99%

Answer 1

Correct Answer - Option 2 : 50%

Concept-

Probability Factor is given by

\(z = \frac{{x - \bar x}}{\sigma }\)

Where,

σ is Standard Deviation

x is mean

For,

 z = 0, P (Z) = 50 %

Z < 0, P (Z) < 50 %

Z > 0, P (Z) > 50%

When expected activity duration is considered then the probability factor z = 0. So 50% probability is considered for expected activity duration.