# Please some to help with this biz math question, its taken me weeks!!

• Jun 14th 2012, 08:55 PM
gpeterson07
Please some to help with this biz math question, its taken me weeks!!
I have attached the question with the charts.

I know that I have A1, A1a, and A2 correct. What I need help on are these answers I have come up with:

For A3a. I have the answer: Expected duration of the entire project A-C-E-H-J = 27 weeks B-D-H-J = 33 weeks B-F-G-I-J = 33.5 weeks

For A3b. I have the answer: slack for project a = 33.5-27 = 6.5 weeks

For A3c. I have the answer: slack for project task H = 33.5-33 = 0.5 weeks

For A3d. I have the answer: the week project task F is scheduled to start 8th week.

For A3e. I have the answer: the week project l is scheduled to finish 30th week.

For A4. I have the answer: Determine the probability of completing this project in time for the product launch in 34 weeks. (D-S)/Square root V = 34-33.5/6.53^.5 = .5/2.5553 = 0.2 Probability = .0793 or 7.93%

I know that I have B1, B2 and C1 correct What I need help on is:

For C2. I have the answer: Both tasks should be crashed by the maximum possible: 4.5 weeks for Task D and 4 weeks for Task F for a total time saving of 8.5 weeks.

For C3. I have the answer: Taken individually, crashing cost will come to \$8,000 across all 4.5 weeks Task D will be compressed while the corresponding cost to save 4 weeks on Task F will come \$4,000.

I have been working on this problem for about 2 weeks now. It's tough, but it's the last problem before I finish this class. PLEASE HELP!!!!!
• Jun 15th 2012, 06:32 AM
mfb
Re: Please some to help with this biz math question, its taken me weeks!!
I would assume that "expected duration of the entire project" is a single number. Or are 27 and 33 intermediate calculation steps? Might be fine. Nasty correlations in the paths.

A4: If your expected duration is a bit less than 34 weeks, the probability should be close to 50%, not 8%. I would expect an evaluation of a gaussian distribution or something similar here.

Quote:

4.5 weeks for Task D and 4 weeks for Task F for a total time saving of 8.5 weeks.
How can you save 8.5 weeks if D and F are done in parallel and save 4.5/4 weeks each?

Bonus question: Add 2 weeks planning time, how you can you crash the tasks to save this time? :D
• Jun 15th 2012, 09:14 AM
SpringFan25
Re: Please some to help with this biz math question, its taken me weeks!!
We do not help with work that appears to contribute to your final grade