Question

There are 650 students in the graduating class at East Community College. Of these students, 48 percent plan to attend graduation and 44 percent don't plan to attend. The rest have not decided. How many students are not sure they will attend?

Answer 1

there are only three categories a student can belong to: 1) plan to attend graduation, 2) don't plan, and 3) not sure of whether they will attend

therefore, (students who are unsure) = (total # of students) - (# who plan to attend) - (# who don't plan to attend)