Question: 34. (a) Find the moment-generating function of a random variable X having the density function fx 1 8 3 x I 0;1;2;3

34.

(a) Find the moment-generating function of a random variable X having the density function fðxÞ ¼ 1 8

3 x

 Ið Þ 0;1;2;3 ðxÞ:

(Hint: Use of the binomial theorem may be helpful in finding a compact representation of this function.)

Use the MGF to calculate the first two moments of X about the origin. Calculate the variance of X.

(b) Repeat

(a) using the density function fðxÞ ¼ 1 10 ex=10Ið Þ 0;1 ðxÞ:

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