terça-feira, setembro 05, 2006

PMP Question - Task Duration

Question :

"An Activity has an Optimistic estimate of 10 days, pessimistic estimate of 16 days, most likely estimate of 13 days. If your company has a quality requirement of 6 sigma, what is the duration within which this task must be completed?

A. 10 days to 16 days
B. 7 days to 19 days
C. 12 days to 14 days
D. 11 days to 15 days"

Answer :

In a Normal Distribution, the PERT duration (also called mean)
= (Pessimistic + 4* (Most Likely) + Optimistic)/6
= (10 + 4 * 13 + 16)/6
= 13

1 Standard Deviation (sigma)
= (Pessimistic - Optimistic) / 6
= (16 - 10) / 6
= 1
Mean - 6 sigma = 13 - 6* 1 = 7
Mean + 6 sigma = 13 + 6* 1 = 19

So, if the the company has a quality requirement of 6 sigma, then the task can be completed within 7 days to 19 days ( option B ).

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