(1 point) Let the random variable X be the number of rooms in a randomly chosen owner-occupied housing unit in a certain city. The distribution for the units is given below. X 3 4 5 6 7 8 9 10 f(x) 0.07 0.29 0.37 0.16 0.03 0.04 0.02 ? (a) Is X a discrete or continuous random variable? ? (b) What is the probability of choosing a unit with 10 rooms? (c) What is the probability that a unit chosen at random has at least 7 rooms? (d) What is the probability that a unit chosen at random has less than 7 rooms? (e) What is the probability that a unit chosen at random has between 6 and 7 rooms (inclusive)