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net income standard deviation

how would you find the standard deviation of the net income? 

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Kenneth S. | Algebra/Trig/Precalculus/Calculus Instructor Can Be Your TutorAlgebra/Trig/Precalculus/Calculus Instru...
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The standard deviation is a calculation based on a set of data; the formula/procedure is well known.


And calculators have the ability to find the s.d. of a set of data that you may input as a list. (STAT 1-var)