### standard deviation of a function of two variables

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**June 20th, 2005, 9:35 am** I'm wondering if anyone has a quick answer to the following question: Suppose we have two random variables x and y, with probability distributions f(x) and g(y), and a consider a function h(x, y) of x and y. Is there a general formula for the standard deviation of h in terms of x and y?