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The variance of the completion time for a project is the sum of variances of
  • a)
    all activity times
  • b)
    non-critical activity times
  • c)
    critical activity times
  • d)
    activity times of first and last activities of the project
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The variance of the completion time for a project is the sum of varia...
Explanation:


The variance of the completion time for a project is the sum of variances of critical activity times. This is because critical activities have no slack time, and any delay in critical activities will delay the overall completion time of the project. Thus, the critical activity times have the greatest impact on the completion time variance.

Reasoning:


The variance of completion time for a project is a measure of the spread of completion times around the expected completion time. It is affected by the variance of the activity times and the dependencies between the activities. The critical path of a project is the longest path of dependent activities, and any delay in a critical activity will delay the overall completion time of the project. Therefore, the critical activity times have the greatest impact on the variance of the completion time of the project.

Conclusion:


In conclusion, the variance of the completion time for a project is the sum of variances of critical activity times. This is because critical activities have no slack time, and any delay in critical activities will delay the overall completion time of the project. Therefore, it is important to identify and focus on critical activities to minimize the variance of the completion time of the project.
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