Develop a Network Drawing for Hill Construction and Determine the Critical Path. How Long Is the Project Expected to Take?
Autor: byjujoy • April 18, 2016 • Exam • 709 Words (3 Pages) • 1,584 Views
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1. Develop a network drawing for Hill construction and determine the critical path. How long is the project expected to take?
Answer:
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Critical Path[pic 4]
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Critical Path[pic 6]
Critical Path:
ACDGHIL = 30+65+55+30+20+30+30= 260 DAYS
2. What is the probability of finishing in 270 days? What is the probability of finishing in more than 280 days?
Answer:
Project Variance  319.4444444 
Project Standard Deviation  √Variance 
√319.4444444  
17.87 Days 
Probability to finish in 270 days  
Z=(Due Date Expected Date)/Project standard Deviation  (270260)/17.87 
Z  0.56 
Checking the z=0.56 on the table we can observe that the probability (T<=270) is 71% 
Probability to finish in more than 280 days  
Z=(Due Date Expected Date)/Project standard Deviation  (280260)/17.87 
Z  1.12 


Checking the z=1.12 on the table we can observe that the probability (T>280) is (10.8686) i.e 13.14% 
3. If it is necessary to crash to 240 days, how would Hill do so, and at what costs? As noted in the case, assume that optimistic time estimates can be used as crash time.
Answer:
Critical Path  Crash Costs Per Day on Critical Path  Crash Times (Optimistic) on Critical Path 
 ($) 

A  1500  20 
C  4000  50 
D  1900  30 
G  2500  25 
H  2000  10 
I  2000  20 
L  4500  20 
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Critical Path[pic 8]
Crashing down 20 days will be effective if Hill crashes 10 days in A. Hill cannot crash down more as crash time cannot go below the optimistic value.
Crash down of A by 10days = 10 * 1500 =$15000
For crashing 10 more, we need to crash in the next least Costs Per Day activity i.e D. We will crash 10 days from D.
Crash down of D by 10days = 10 * 1900 =$19000
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