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In calculus, and especially multivariable calculus, the mean of a function is loosely defined as the average value of the function over its domain. In one variable, the mean of a function f(x) over the interval (a,b) is defined by Recall that a defining property of the average value of finitely many numbers is that . In other words, is the constant value which whenadded to itself times equals the result of adding the terms of . By analogy, adefining property of the average value of a function over the interval is that

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• Mean of a function
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• In calculus, and especially multivariable calculus, the mean of a function is loosely defined as the average value of the function over its domain. In one variable, the mean of a function f(x) over the interval (a,b) is defined by Recall that a defining property of the average value of finitely many numbers is that . In other words, is the constant value which whenadded to itself times equals the result of adding the terms of . By analogy, adefining property of the average value of a function over the interval is that
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• In calculus, and especially multivariable calculus, the mean of a function is loosely defined as the average value of the function over its domain. In one variable, the mean of a function f(x) over the interval (a,b) is defined by Recall that a defining property of the average value of finitely many numbers is that . In other words, is the constant value which whenadded to itself times equals the result of adding the terms of . By analogy, adefining property of the average value of a function over the interval is that In other words, is the constant value which when integrated over equals the result ofintegrating over . But by the second fundamental theorem of calculus, the integral of a constant is just See also the first mean value theorem for integration, which guaranteesthat if is continuous then there exists a point such that The point is called the mean value of on . So we write and rearrange the preceding equation to get the above definition. In several variables, the mean over a relatively compact domain U in a Euclidean space is defined by This generalizes the arithmetic mean. On the other hand, it is also possible to generalize the geometric mean to functions by defining the geometric mean of f to be More generally, in measure theory and probability theory, either sort of mean plays an important role. In this context, Jensen's inequality places sharp estimates on the relationship between these two different notions of the mean of a function. There is also a harmonic average of functions and a quadratic average (or root mean square) of functions.
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