It’s the probability that X and Y fall between their stated limits within a continuous joint probability distribution. b. It’s the height of a joint continuous density function. c. It’s the joint probability that X equals some value and that Y equals some value in a joint discrete distribution. d. It’s the probability that X equals some value or that Y equals some value in a joint discrete distribution. e. It’s the expected value of X and Y, given a valid joint discrete distribution.