Standard Deviation caculation question - PLEASE HELP!
Could you please let me know which answer is correct and why? Thanks!
A project manager made 3-point estimates on a critical path and found the following results:
Assuming ±3 sigma precision level for each estimate, what is the standard deviation of the allover path?
|App. 4.2 days|
|App. 5.2 days|
|App. 6.2 days|
You can not derive the path standard deviation from the information given.