Consider the following activities in a project to be planned using PERT. The thr

Question

Consider the following activities in a project to be planned using PERT. The three time estimates (in weeks) are given in the table below. You may wish to draw the network to help you answer the questions. Management wishes to find the probability that the project will be finished in a particular time, normal distribution will used to do this usual assumptions are made). To use this normal distribution, the mean and variance (and standard deviation)must be found from the data above. The mean (expected) completion time for this project is ______ project variance = ____________

Explanation / Answer

Critical path is ABD.

So mean = 27.7 days

Variance = 5.1 days

Activity a m b (a+4m+b)/6 (b-a)^2/36 A 6 7 8 7.0 0.1 B 11 14 17 14.0 1.0 D 4 5 16 6.7 4.0 27.7 5.1

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