## Reply: Why is this the correct answer?

 Name E-mail Your e-mail address will never be displayed on the site. Subject Message [quote="Ivan Fućak" post=4774]You can use following link for calculation: http://www.firebrandtraining.co.uk/learn/pmp/course-material/project-time-management/estimate-activity-durations You have to calculate standard deviation for each activity. (24-12)/6=2, (14-8)/6=1, (27-15)/6=2, 28-10)/6=3, (35-17)/6=3 Variances of each activities are squares of deviations of activities. Stand.deviation of path is square root of sum of variances: SQRT(4+1+4+9+9)=SQRT(27)=[b]5,19[/b][/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

Aditi Kapoor

I didn't understand y it is 5.2 days also what's the logic behind this.
SD=P-O/6
Could you please explain?
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.
If not, PLEASE explain me.

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