Question

Let S4 = X1 + ... + X4 is the sum of 4 independent random variables,...

Let S4 = X1 + ... + X4 is the sum of 4 independent random variables, and each Xi is exponential with
λ = 3. Find the moment generating function m(t) for S4. Also find m′(0) and m′′(0）
Math   Statistics-And-Probability   
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Answer #1

MGF of Exponential

We will use the two information above,

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