The expected completion time of a project is 40 weeks and the variance of its critical path activities is 9.Project completion time is 42.0325 weeks.
Variance of its critical path activity 9 weeks.
Therefore, Standard deviation of its critical path activity = Square root ( variance) = Square root (9) = 3
Project completion time with 5% certainty means probability of project completion - 0./5 Corresponding z value for probability of 0.75 = NORMSINV ( 0.75) = 0.6745
Therefore, project completion time with 75% certainty = Expected completion time of the project .
Value x Standard deviation of critical path activity = 40 weeks * 0.6745 x 3 weeks = 40-2.0235 = 42.0325 weeks
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