The PERT formula is typically calculated as:
A. (O+M+P)/6
B. (O+4M+P)/6
C. (O+M+P)/3
D. (O+4M+P)/3
Answer: B. (O+4M+P)/6
PERT is a weighted average, typically with emphasis on the most likely (M). So if you're going to calculate 1x optimistic plus 4x most likely plus 1x pessimistic, that's six variables. Therefore, you would divide by six to get a weighted estimate.
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