Project Management Professional (PMP) Exam Practice – Question1971 Calculate the standard deviation for the following: Pessimistic=20, Optimistic=10, Realistic=17. A. 6 B. Not enough information C. 5.67 D. 1.67 Show Answer Hide Answer Correct Answer: D Post navigation Project Management Professional (PMP) Exam Practice – Question1970Project Management Professional (PMP) Exam Practice – Question1972