The distribution function of a random variable x has

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The distribution function of a random variable x has the form f (x) = Ax at 0 - x - a. Outside this interval of f (x) = 0; A and a - constants. Assuming that a given, a: A constant value for which the function f (x) will be normalized; mean values x and x2, the average value of 1 / x.

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Task 20687. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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