Civil Engineering - UPSC Civil Service Exam Questions - Discussion
Discussion Forum : UPSC Civil Service Exam Questions - Section 1 (Q.No. 30)
30.
In a PERT network, the activity durations are given as to (optimistic), tp (pessimistic) and tm (most likely time). What is the variance of is activity ?
None of the above
Discussion:
14 comments Page 1 of 2.
Lloyd P said:
1 decade ago
Letter (B) corresponds to Standard Deviation of an Activity.
Squaring such will yield to Variance of an Activity, in this regard the answer should be Letter (C).
Squaring such will yield to Variance of an Activity, in this regard the answer should be Letter (C).
Engr Shbabir said:
1 decade ago
Optimistic time (O) : the minimum possible time required to accomplish a task, assuming everything proceeds better than is normally expected.
Pessimistic time (P) : the maximum possible time required to accomplish a task, assuming everything goes wrong (but excluding major catastrophes).
Most likely time (M) : the best estimate of the time required to accomplish a task, assuming everything proceeds as normal.
Expected time (TE) : the best estimate of the time required to accomplish a task, accounting for the fact that things don't always proceed as normal (the implication being that the expected time is the average time the task would require if the task were repeated on a number of occasions over an extended period of time).
So Option A is right.
Pessimistic time (P) : the maximum possible time required to accomplish a task, assuming everything goes wrong (but excluding major catastrophes).
Most likely time (M) : the best estimate of the time required to accomplish a task, assuming everything proceeds as normal.
Expected time (TE) : the best estimate of the time required to accomplish a task, accounting for the fact that things don't always proceed as normal (the implication being that the expected time is the average time the task would require if the task were repeated on a number of occasions over an extended period of time).
So Option A is right.
Rakesh said:
1 decade ago
"B" is standard deviation.
"C" is variance.
"C" is variance.
Ashok Sharma said:
10 years ago
A is expected time.
B is standard deviation.
C is variance.
B is standard deviation.
C is variance.
Raviteja said:
8 years ago
Answer is C.
Puni said:
8 years ago
Answer is C.
Mike Edrad said:
8 years ago
I think the Correct answer is C.
Dev C said:
7 years ago
Yes, the answer is C. Because B is the standard deviation. And we know Standard deviation equals to the square root of the variance.
Anil Kumar said:
7 years ago
The Right answer is C.
Option B is right for Standard deviation.
Option B is right for Standard deviation.
Pawan said:
7 years ago
C is the correct option.
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