Della works as a project manager for BlueWell Inc. She has asked her assistant Beth to provide activity duration estimate for an activity. Beth provides Della the following estimate chart:

What will be the activity duration according to the PERT three-point analysis?
Correct Answer: C
Explanation/Reference:
Explanation:
A three-point estimate records the optimistic, most likely, and the pessimistic duration and then records an average for the predicted duration. Three-point estimate is a way to enhance the accuracy of activity duration estimates. This concept is originated with the Program Evaluation and Review Technique (PERT).
PERT charts the following three estimates: Most likely (TM): The duration of activity based on realistic factors such as resources assigned, interruptions, etc. Optimistic (TO): The activity duration based on the best-case scenario Pessimistic (TP): The activity duration based on the worst-case scenario The expected (TE) activity duration is a weighted average of these three estimates: TE = (TO + 4TM + TP) / 6 Duration estimates based on the above equations (sometimes simple average of the three estimates is also used) provide more accuracy.
Here it is,
TE = ( 24 + 28*4 + 36) / 6
= 272/6
= 29 (approx)
Incorrect Answers:
A, B, D: These are not the valid answers for this question.