A data set has Q1 = 20, median = 30, Q3 = 40. What is the IQR? A 10 B 20 C 30 D 40 ✓ Correct Answer: Option B IQR = Q3 − Q1 = 40 − 20 = 20. Practice SAT Exam Prep Quizzes → Browse All Questions Study Flashcards