Given a contingency table showing the number of students who prefer different study methods (group study, solo study) across two departments (Science, Arts), how would you calculate the marginal total for the Science department?

• A. Divide the total number of students by the number of study methods
• B. Add the number of students who prefer group study and solo study in the Science department
• C. Subtract the number of students in the Arts department from the total number of students
• D. Multiply the number of students who prefer group study by those who prefer solo study

Answer: (B)