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# TOPIC: Why is this the correct answer?

## Why is this the correct answer? 9 years 9 months ago #4589

 SANDHYARANI P BHIDE Topic Author Offline Fresh Boarder Posts: 4 Thank you received: 1 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 ( App. 5.2 days (C) App. 6.2 days (D) You can not derive the path standard deviation from the information given. Attachments: Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Why is this the correct answer? 9 years 7 months ago #4774

 Ivan Fućak Offline Fresh Boarder Posts: 1 Thank you received: 0 You can use following link for calculation: www.firebrandtraining.co.uk/learn/pmp/co...e-activity-durations You have to calculate standard deviation for each activity. (24-12)/6=2, (14-/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)=5,19 Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Why is this the correct answer? 7 years 11 months ago #7772

 Mohammed Yaseen Visitor 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. Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Why is this the correct answer? 7 years 7 months ago #8918

 shravan Visitor Waw...Super..I got it...thanks a lot...dint understand logit behind t ...but doesnt matter Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Why is this the correct answer? 7 years 7 months ago #8926

 Hazem Ibrahim Offline Senior Boarder Posts: 58 Thank you received: 2 please note that putting ±3 sigma precision level in the question is meaningless and useless it is just to scatter you away Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Why is this the correct answer? 6 years 11 months ago #10997

 Aditi Kapoor Visitor 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? Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Why is this the correct answer? 6 years 9 months ago #11818

 Anonymous Visitor So how to solve this problem? Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Why is this the correct answer? 4 years 7 months ago #18919

 Mukhwana Visitor @Ivan Fućak, thank you very much for that answer. 4 years later and your answer is sitll helping out folks. Much appreciated! Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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