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Let Y = 221:1 X;- be the sum of a random sample X1, . . . ,Xn and Z = i2?=1 Xi be the sample

Let Y = 221:1 X;- be the sum of a random sample X1, . . . ,Xn and Z = i2?=1 Xi be the sample mean. Find the distributions of Y and Z under each of the following distributions for X. (a) X N EXPW) (b) X N Gamma(oz,[3) (C) X N N(H702)

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