ospinternational
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The following PMPĀ® exam sample question is taken from the Free PMP Exam Simulator (The answer is at the very bottom):

You are managing a construction project. You have just finished defining your activities and you are now estimating their durations. Obtaining government permits is one of the project activities that is critical to the success of your project. You obtain expert opinion regarding time requirements for this activity, and you have determined that the duration will most likely be 15 days. It would be very optimistic to expect to obtain the permits in 10 days. In addition, taking the current environmental factors into consideration, it may take up to 30 days to obtain the permits. What estimate should you use for this activity if you want to put more weight on the most likely duration with a further 10 percent contingency reserve? (Round to the nearest day.)
A) 17 Days
B) 18 Days
C) 20 Days
D) 33 Days

Hint: Use the PERT formula to determine your initial estimate.

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Until Next Time,
Cornelius Fichtner, PMP
President, OSP International LLC
https://www.projectmanagementprepcast.com
Answer and Explanation:
The Correct Answer is B. As you want to put more weight on the most likely estimate, you should use the PERT formula for your initial estimate rather than taking a simple average of the three values. Your PERT estimate will be (10 + 4*15 + 30) / 6 = 16.67 days. Adding a 10 percent contingency reserve to it will give 16.67*1.1 = 18.33 days. Rounding your estimate to the nearest day will give 18 days.
