The project described by: Activity/ Immediate Predecessor/ Optimistic / Most lik

Question

The project described by:
Activity/ Immediate Predecessor/ Optimistic / Most likely /Pessimistic /Standard Deviation/ Variance
A/ -- / 4 / 5 / 6 / 0.333 / 0.111                                             
B / -- / 12 / 16 / 18 / 1.000 / 1.000
C/ a / 2 / 8 / 14/ 2.000 / 4.000                         
D / a / 5 / 5 / 5 / 0.000 / 0.000
E / b,c / 6 / 7 / 8 / 0.333 / 0.111

According to Table 12-3, there are five activities in a PERT project. What is the variance of the critical path?

5.222

4.222

1.222

0

1.111

5.222

4.222

1.222

0

1.111

Explanation / Answer

1.222

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