Question: Let X ~ Norm(4, 25). Approximate the following probabilities without using software: (a) P(X > 6). (b) P(9 1). Suppose X,- ~ Norm(i, i) for

Let X ~ Norm(4, 25). Approximate the following probabilities without using software: (a) P(X > 6). (b) P(9 1). Suppose X,- ~ Norm(i, i) for i = 1, 2, 3, 4. Further assume all the Xi's are inde- pendent. Find P(X1 + X3

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