The difference between a random variable and a probability distribution is. Select one: O a. a probability distribution can only assume whole numbers O b. a random variable can only assume whole numbers O c a random variable does not include the probability of an event O d. a random variable include the probability of an event Which probability distribution has the following probability density function:? Select one: Q a. Exponential O b. Uniform O c. Binomial O d. Poisson