Name E-mail Your e-mail address will never be displayed on the site. Subject Message [quote="SANDHYARANI P BHIDE" post=4589]Hi, I don't understand how this answer was calculated for the question from Oliver Lehmann's free 75 question test. Can anyone please enlighten? The correct answer is B ie. approx. 5.2 days. 27. A project manager made 3-point estimates on a critical path and found the following results: (Check attached table below) Assuming ±3 sigma precision level for each estimate, what is the standard deviation of the allover path? (A) App. 4.2 days (B) App. 5.2 days (C) App. 6.2 days (D) You can not derive the path standard deviation from the information given.[/quote]

## Topic History of : Why is this the correct answer?

Max. showing the last 6 posts - (Last post first)
10 months 2 weeks ago #18919

Mukhwana

@Ivan Fućak, thank you very much for that answer. 4 years later and your answer is sitll helping out folks. Much appreciated!
3 years 2 weeks ago #11818

Anonymous

So how to solve this problem?
3 years 2 months ago #10997

I didn't understand y it is 5.2 days also what's the logic behind this.
SD=P-O/6
3 years 10 months ago #8926

Hazem Ibrahim

please note that putting ±3 sigma precision level in the question is meaningless and useless it is just to scatter you away
3 years 10 months ago #8918

shravan

Waw...Super..I got it...thanks a lot...dint understand logit behind t ...but doesnt matter
4 years 2 months ago #7772

Mohammed Yaseen

For +_ 3 Sigme, the standard deviation = 3 * Standard Deviation of 1 Sigma prceision level.

So in this case, the standard deviation should be = 3 * 5.19 = 15.57

Hope, I am right.