Railways
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Tool Engineering
question_answer
For the PERT network shown in the given figure, the probability of completing the project in 27 days is?
A)0.841
B)0.919
C)0,964
D)0.977
Correct Answer:
A
Solution :
Critical path: \[1-2-4-5\] Critical time = 23 days Standard deviation, \[\sigma =\sqrt{{{2}^{2}}+(2.8)+{{2}^{2}}}\] = 3.98 \[z=\frac{27-23}{3.98}=1\] For z = 1, area under the normal distribution curve = 0.8413 Probability of completing the project =0.841