In PERT analysis, individual activity durations are assumed to follow a probability distribution because:
Choose the correct answer
Normal distribution best fits all construction activities
Beta distribution is bounded (has minimum and maximum values), suitable for activity durations
Poisson distribution applies to random events on construction sites
Exponential distribution models the decay of activity uncertainty over time
Correct Answer
B. Beta distribution is bounded (has minimum and maximum values), suitable for activity durations
Why is this the answer?
PERT uses the Beta distribution because activity durations are bounded: they cannot be negative and have a definite maximum. Beta is flexible — it can be symmetric or skewed — and requires only three time estimates (a, m, b). The project duration approximates a normal distribution via CLT.
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