Stefan wants an 86% probability that the actual hours needed to finish his project will be less than or equal to the estimated hours. For his estimate, what value on a bell curve should Stefan select?

A

the value of the best-case scenario multiplied by two, divided by the worst-case scenario

B

the average number of hours, as represented at the peak of the bell curve

C

the value halfway between the best-case number of hours and the average number of hours

D

the value halfway between the average number of hours and the worst-case number of hours