What is the interquartile range of: 2, 5, 7, 8, 12, 14, 18? A 9 B 7 C 12 D 6 ✓ Correct Answer: Option A Q1 = 5, Q3 = 14. IQR = Q3 − Q1 = 14 − 5 = 9. Practice SAT Exam Prep Quizzes → Browse All Questions Study Flashcards