Mechanical Engineering - Industrial Engineering and Production Management - Discussion
Discussion Forum : Industrial Engineering and Production Management - Section 2 (Q.No. 6)
6.
A PERT network has three activities on critical path with mean time 3, 8 and 6 and standard deviations 1, 2 and 2 respectively. The probability that the project will be completed in 20 days is
Discussion:
27 comments Page 2 of 3.
Udita Jain said:
1 decade ago
Sigma = 3.
Te = 3+8+6 = 17.
(20-17)/3 = 1.
So probability = 84%.
Te = 3+8+6 = 17.
(20-17)/3 = 1.
So probability = 84%.
Chandu said:
2 years ago
Z = (20-17)/√(1²+2²+2²),
Z = (20-17)/3,
Z = 1,
So P(1)= 0.842.
Z = (20-17)/3,
Z = 1,
So P(1)= 0.842.
Harsh said:
8 years ago
I am not getting it, please explain in detail.
Mastan said:
6 years ago
@All.
Here standard deviation means "sigma".
Here standard deviation means "sigma".
(1)
Sumit agrawal said:
1 decade ago
Tell me about this question in detail.
Prakash patel said:
1 decade ago
What is sigma? Please explain briefly.
Sumit Patil said:
7 years ago
Yeah, 0. 66 is right. I agree @Nir.
Ramanathan said:
1 decade ago
What is the 20? Is it from formula?
Pawan said:
6 years ago
Yeah, 0.66 is right the right one.
(1)
Sachin said:
10 years ago
(20-3-8-6)/(1^2+2^2+2^2)^1/2 = 1.
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