3. Suppose that X - N(3.2, 6.5), Y ~ N(-2.1, 3.5), and Z ~ N (12.0, 7.5) are independent random variables. Find the probability that (a) X+Y >0 (b) X+Y-2Z<-20 (c) 3X+5Y >1

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A: It is very useful in statistics . It is the most basic probability distribution .

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A:

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