Analysis of a PERT problem shows the estimated time for the critical path to be 108 days with a variance of 64.There is a .90 probability that the project will be completed before approximately day:
A)98.
B)108.
C)109.
D)115.
E)118.

Question

Quizplus · Accepted Answer

To find the day with a 0.90 probability, use the Z-score formula: Z = (X - μ) / σ. Here, μ = 108, σ = √64 = 8. For 0.90 probability, Z ≈ 1.28. Solving 1.28 = (X - 108) / 8 gives X ≈ 118.

Analysis of a PERT Problem Shows the Estimated Time for the Critical