阿摩線上測驗
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阿摩線上測驗
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5. The random variables X and Y have the joint probability density func tion
where -∞ ＜x＜ ∞ and -∞ ＜ y ＜ ∞ .
(d) (8%) Let Z = 3X + 2Y. Derive the moment generating function 
. You have to give the derivation, not just the an- swer.