Given the following estimates: Optimistic 3 days, Pessimistic 9 days, and most likely 6 days, what is the PERT weighted average?

A.
4

B.
6.3

C.
6

D.
6.1

Explanation:
Simple Average Duration Estimate = (O + M + P)/3

PERT Duration Estimate = (O + 4M + P)/6