The standard deviation of the critical path of the project

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Direction: Consider a PERT network for a project involving six tasks (a to f)

The standard deviation of the critical path of the project is

1. √151 days
2. √155 days
3. √200 days
4. √238 days

Correct Option: A

√25 + 81 + 36 + 9 = √151 days.