Asurvey was conducted with high school students in each grade to see how many prefer math or science. some of the data are shown below. which statement is true about the joint frequencies in this table? a. twenty-three 9th graders and fifteen 11th graders prefer math. b. fourteen 11th graders prefer math and eight 10th graders prefer science. c. thirty-five 12th graders prefer math and nine 10th graders prefer science. d. twenty-three 9th graders and thirty-two 12th graders prefer math.