74. Let (,...,) denote the joint moment generating function of X > > Xn
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74. Let ö(ßß,...,ßç) denote the joint moment generating function of X\ > · · · > Xn ·
(a) Explain how the moment generating function of Xi9 Ö×ß(ßß)> can be obtained from ö(ß÷, ..., tn).
(b) Show that ×ë, ...,Xn are independent if and only if
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