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6. (15 marks) You are given moment generating function of a discrete random variable X: 0.7e M(t) =- 1-0.3e , where t*, x = 3,

6. (15 marks) You are given moment generating function of a discrete random variable X: 0.7e M(t) =- 1-0.3e , where t*, x = 3, 4,5,... (a) Find the constant c. (b) Find the moment generating function of X. (c) Find the mean and variance of X

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