Question: Problem 7 (a) Let X1, X2 ~ iid Normal(0,1). Find the joint pdf for (X?, X?). (b) Use your answer in part (a) to find

Problem 7 (a) Let X1, X2 ~ iid Normal(0,1). Find the joint pdf for (X?, X?). (b) Use your answer in part (a) to find the distribution of X? + X3. This is a commonly known distribution; identify it

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