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Random variable
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==Some properties== * The probability distribution of the sum of two independent random variables is the '''[[convolution]]''' of each of their distributions. * Probability distributions are not a [[vector space]]โthey are not closed under [[linear combination]]s, as these do not preserve non-negativity or total integral 1โbut they are closed under [[convex combination]], thus forming a [[convex subset]] of the space of functions (or measures).
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