The standard deviation of a project duration is equal to the sum of the variances of all the activities of the project.

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The standard deviation of a project's duration is not equal to the sum of the variances of all the activities of the project since variance measures the spread or variability of a single random variable, while standard deviation measures the spread or variability of a set of observations or data points. The standard deviation of a project's duration takes into account the dependencies and interrelationships between the different activities of the project, which cannot be captured by simply adding up the variances of the individual activities.

The Standard Deviation of a Project Duration Is Equal to the Sum