What are the minimum, first quartile, median, third quartile, and maximum of the data set? 9, 20, 4, 18, 4, 18, 20, 9 a. minimum 4; first quartile 10; median 16.25; third quartile 19.5; maximum 20 b. minimum 4; first quartile 6.5; median 13.5; third quartile 19.5; maximum 20 c. minimum 4; first quartile 6.5; median 13.5; third quartile 19; maximum 20 d. minimum 4; first quartile 5.25; median 16.25; third quartile 19; maximum 20