GATE 2016 CE (CE1) – Question 49
The four activities on a PERT critical path have optimistic, most likely and pessimistic durations (days) of (8,10,14), (6,8,11), (5,7,10) and (7,12,18). The expected project duration is ______ days.
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Correct answer: 37 to 38
Explanation
PERT expected duration for an activity is(a+4m+b)/6. The four activities give62/6,49/6,43/6 and73/6 days. Since they lie sequentially on the stated path, add these values to get227/6=**37.83days**. Variances are not required for the mean duration.