the time required to complete a project is normally distributed with a mean 80 weeks and a standard deviation of 10 weeks.

the time required to complete a project is normally distributed with a mean 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 of the contract. if a construction company bidding on this contract wishes to be 90 percent sure to finishing by the due date, what due date (project week #) should be negotiated?