Hi All ,

i have an doubt in a standard deviation related question.

Q: The expected value for your project duration estimate is 627 days, and the most likely duration estimate is 575. The standard deviation is 14. Which of the following statements is true?
 

A. A 95 percent confidence factor would make this project duration between 547 days and 603 days.
B. The project duration—given a 95 percent confidence factor—is between 613 days and 641 days.
C. The project duration—given a 99.7 percent confidence factor—is between 585 days and 669 days.
D. A 68 percent confidence factor would make this project duration between 547 days and 603 days.

Can anybody please explan what is the correct answer for this question.

Thanks,

Novjot