Obtaining uniform random numbers as instructed at the beginning of the Problems section, generate two random observations from each of the following probability distributions.

(a) The exponential distribution with mean 4

(b) The Erlang distribution with mean 4 and shape parameter k 2 (that is, standard deviation 22)

(c) The normal distribution with mean 4 and standard deviation 22. (Use the central limit theorem and n 6 for each observation.)