Determine the value e so that each of the following functions can serve as probability distributions of the discrete random variable X: a. f(x)=c(x² +4) for x = 0,1, 2, 3; 3 b. f(x)=c for x = 0,1, 2 x 3-x

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A: Correct answer c= 0.014493

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A: mean=E(X)=∑1nxP(X=x)