In PERT analysis, the time estimates of each activity and probability of occurrence follow
- ANormal distribution curve
- BPoisson distribution curve
- CBinominal distribution curve
- DBeta distribution curveCorrect
Solution
Concept
Probability distribution of activity time in PERT
Formula
NONE
Step-by-step solution
1. PERT analysis models activity completion times using probabilistic distributions. 2. Time estimates account for optimistic, most likely, and pessimistic completion durations. Answer: D
Explanation
In PERT analysis, individual activity duration estimates are based on optimistic, most likely, and pessimistic times, which follow a continuous Beta distribution curve. This asymmetric distribution effectively models the variability and uncertainty inherent in task durations. Therefore, option D is correct.
Why the other options are wrong
A) Normal distribution applies to overall project duration rather than individual activity estimates. C) Binomial distribution is used for binary outcomes rather than continuous time estimation.
Shortcut
Activity time in PERT follows a Beta distribution curve.
Common mistake
Confusing the Beta distribution of individual activity times with the Normal distribution of total project duration.
Correct answer: D) Beta distribution curve