explanations pls and thank you

(8 points) Let the random variable .X be the number of rooms in a randomly chosen owner-occupied housing unit in a certain city. The probability distribution function for the units is given below. X 3 5 6 7 8 9 10 Pr(X) 0.07 0.22 0.39 0.2 0.03 0.05 0.03 a. Find Pr(X = 10). the probability of randomly choosing a unit with 10 rooms. b. Find Pr(4