ISTQB Certified Tester Foundation Level v4.0 — Question 6

You are working on calculating the estimation for a project. You have been given the following numbers by your manager, who is considered to be an expert in estimation:

Optimistic = 35 days -

Likely = 40 days -

Pessimistic = 65 days -
Apply the three-point estimation technique, what is the proper expression of the final estimate?

Answer options

• A. E is 46.3 days, SD = 35
• B. E is 40 days, SD = 6.67
• C. E is 37.3 days, SD = 43.3
• D. E is 43.3 days, SD = 5

Correct answer: D

Explanation

The correct answer is D because the three-point estimation formula calculates the expected duration (E) as (Optimistic + 4*Likely + Pessimistic) / 6, resulting in approximately 43.3 days, with a standard deviation (SD) calculated from the range of estimates. The other options do not accurately reflect the correct calculations based on the three-point estimation technique.