Sean WhitakerPass the PMP® Exam10.1007/978-1-4842-2074-0_15

15. Formulas to Remember

Sean Whitaker¹

(1)

ChristChurch, Canterbury, New Zealand

Communications	How many people in a communications network; n=number of people	$=n\left(n-1\right)/2\frac{n\left(n-1\right)}{2}$
PERT	Weighted average of three estimates (optimistic, realistic, and pessimistic)	$=\left(O+\left(4\times R\right)+P\right)/6\frac{\left(O+(4R)+P\right)}{6}$
Standard deviation (SD)	A PMBOK^® Guide heuristic for calculating standard deviation from the mean 1SD either side of the mean ≈ 68% 2SD either side of the mean ≈ 95% 3SD either side of the mean ≈ 99.7%
Variance	The standard deviation ...

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Pass the PMP® Exam: Tools, Tips and Tricks to Succeed, Second Edition by Sean Whitaker