Name E-mail Your e-mail address will never be displayed on the site. Subject Message [quote="Scott Smith" post=11334]Hello, PERT standard deviation nets the same answer as PERT Deviation all activities. What am I missing? Having both the square root and to the power of 2 in the PERT Deviation all activities cancel each other out. Pessimistic = 10 Optimistic = 8 Standard deviation - (10-8)/6 = .33 PERT Deviation all activities - square root (10-8)/6 power of 2 = .33[/quote]

Topic History of : PERT formulas

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3 years 3 months ago #11334

Scott Smith

Hello, PERT standard deviation nets the same answer as PERT Deviation all activities. What am I missing?
Having both the square root and to the power of 2 in the PERT Deviation all activities cancel each other out.

Pessimistic = 10
Optimistic = 8

Standard deviation - (10-/6 = .33
PERT Deviation all activities - square root (10-/6 power of 2 = .33

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