Question: You are responsible for Quality Audit in an Ongoing Project. The Audit has an optimistic estimate of ten days, pessimistic estimate of sixteen days, and most likely estimate of thirteen days. Assuming a normal distribution, what is the probability that the Audit will be completed within 10 to 16 days?

Answer: In a normal distribution, the

PERT duration (also called mean) {Pessimistic + (4* Most Likely) + Optimistic} / 6 = {16 + (4 * 13) + 10}/6 = 13 days