The time required to complete a project is normally distributed with a mean of 80 weeks and a standard deviation of 10 weeks.The construction company must pay a penalty if the project is not finished by the due date in the contract.If a construction company bidding on this contract wishes to be 90 percent sure of finishing by the due date,what due date (project week #)should be negotiated?
A)81.28
B)92.8
C)81.82
D).81954
E)None of the above

Question

Quizplus · Accepted Answer

To find the due date for 90% certainty, we use the Z-score for 0.90, which is approximately 1.28. Using the formula: Due Date = Mean + (Z-score * Standard Deviation) = 80 + (1.28 * 10) = 92.8 weeks.

The Time Required to Complete a Project Is Normally Distributed