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題目：
Let X and Y be two random variables with joint probability
distribution f(x,y) and marginal distributions g(x) and h(y),
respectively. Please show that the random variables X and Y are
said to be statistically independent if and only if f(x,y) = g(x)h(y)
for all (x,y) within their range. [10%]
請問這題要怎麼證 ??
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