Instructions: type the correct answer in the box. use numerals instead of words. mason conducted a survey of his class to determine if they prefer to use pens or pencils for their math homework. out of the 30 students in his class, 12 of them are male. a total of 21 students said they prefer pencils, and 12 of those students are female. fill in the missing joint and marginal frequencies in the table. pencils pens total male % 10% 40% female % 20% % total 70% % 100%