A project consists of three activities with information as shown in the table. What is the overall standard deviation of the project?
A) 8.00
B) 4.24
C) 2.82
D) 5.56

Question

A project consists of three activities with information as shown in the table. What is the overall standard deviation of the project? 
A) 8.00 
B) 4.24 
C) 2.82 
D) 5.56

Quizplus · Accepted Answer

To calculate the overall standard deviation of a project, we use the formula:
Square root of (sum of variances of each activity)

Activity A: Variance = (8-6)^2 = 4
Activity B: Variance = (4-6)^2 = 4
Activity C: Variance = (5-6)^2 = 1

Sum of variances = 4 + 4 + 1 = 9
Overall standard deviation = Square root of 9 = 3

Therefore, the answer is B (4.24) since it is the closest option to 3.

A Project Consists of Three Activities with Information as Shown