Compute the characteristic function of a random variable X that has as its probability law (i) the binomial distribution with mean 3 and standard deviation 3/2, (ii) the Poisson distribution with mean 3, (iii) the geometric distribution with parameter p = ¼, (iv) the normal distribution with mean 3 and standard deviation!, (v) the gamma distribution with parameters r = 2 and λ = 3.