CAPM (Certified Associate in Project Management) Practice Exam

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What is the formula for the standard deviation in a beta distribution?

(P-O)/6
(P-O)/4
(ML-O)/2
(P-ML)/3

The correct answer is: (P-O)/6

The formula for the standard deviation in a beta distribution is (P-O)/6. This formula is derived from the beta distribution formula, where P represents the pessimistic estimate, and O represents the optimistic estimate. Option B is incorrect because (P-O)/4 is not the correct formula for the standard deviation in a beta distribution. Option C is incorrect because (ML-O)/2 is not the correct formula for the standard deviation in a beta distribution. Option D is incorrect because (P-ML)/3 is not the correct formula for the standard deviation in a beta distribution. The correct formula, (P-O)/6, is used to calculate the standard deviation in a beta distribution, taking into account both the optimistic and pessimistic estimates.