Question on SD- Oliver Lehman 75 Q

Submitted by Sharma on Sun, 05/27/2012 - 21:44

A project manager made 3-point estimates on a critical path and found the following results:

                                    Opti.               MostLikely               Pessi.            PERT Weighted avg

Acti A                           12                  15                              24                  16

Acti B                            8                   9                                14                 9.7
Acti C                           15                  19                              27                 19.7
Acti D                           10                  14                              18                 15.7
Acti E                           17                  20                              35                  22.0

Estimate for Critical Path                                                                         83.1

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.

Please suggest how to calculate?

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Sharma

Sun, 05/27/2012 - 22:00

Please refer Question 31 of Oliver Lehman75 Questions online for the Diagram image.

Q 31. Activity 1 has a duration of 20 days, activity 2 of 10 days, activity 3 of 5 days and activity 4 of 6 days.

Network Diagram Image

 

What is the minimum total duration between the milestones A and B?

36 days
  37 days  
  39days  
  39 days  

sspawar

Sun, 05/27/2012 - 23:12

Dear Mr. Sharma,

Refer old posts of this forum - just by name - Oliver Lehmann or SD OR PERT OR NETWORK DIAGRAM, you will find your answer there.

if not then tell me ,

Regards

projmanpro

Mon, 05/28/2012 - 05:14

See this thread of mine in another forum, i explained everything here.. http://www.pmptrend.com/index.php/en/forum/11-Questions-Answers-Queries-Infos-Etc/88-CPM-Sample-Question#88