A project consists of four consecutive tasks that have average duration and worst-case duration estimates (in days)as shown in the table.Use Newbold's model to determine the aggregated one sigma buffer for this project.
A)20 days
B)10 days
C)15 days
D)5 days

Question

A project consists of four consecutive tasks that have average duration and worst-case duration estimates (in days)as shown in the table.Use Newbold's model to determine the aggregated one sigma buffer for this project. 
A)20 days 
B)10 days 
C)15 days 
D)5 days

Quizplus · Accepted Answer

The formula for aggregated one sigma buffer in Newbold's model is (Z*∑(Pessimistic - Optimistic)) / 6, where Z=1 for one sigma and 6 is the number of tasks. Using the formula, we get (1*((4-2)+(10-6)+(6-4)+(2-1)))/6 = 1*10/6 = 1.67. Rounded up to the nearest whole number, the answer is 2. This means there is a one sigma buffer of 2 days for each task. Therefore, the aggregated one sigma buffer for the project would be 4*2 = 8 days. However, the answer choices only offer 5, 10, 15, or 20 days as options. The closest answer choice is B) 10 days.

A Project Consists of Four Consecutive Tasks That Have Average