Median and quartiles
Descriptive statistics · Mathematics
Study notes
Q: Find the median, Q1, Q3 of: 3, 7, 7, 8, 9, 12, 15. Sorted already, n = 7 (odd). Median = 4th value = 8. Lower half: 3, 7, 7. Q1 = 7. Upper half: 9, 12, 15. Q3 = 12. IQR = Q3 - Q1 = 12 - 7 = 5.