| xi | 15 | 21 | 27 | 30 |
| fi | 3 | 5 | 6 | 7 |
Answer:
N = 21
Median = (21)/2 = 10.5
Median Corresponding to 10.5 is 27
| xi | fi | Cumulative Frequency | |di| = |xi – M| | fi |di| |
| 15 | 3 | 3 | 15 | 45 |
| 21 | 5 | 8 | 9 | 45 |
| 27 | 6 | 14 | 3 | 18 |
| 30 | 7 | 21 | 0 | 0 |
| Total = 21 | Total = 46 | Total = 108 |
N = 21
= 1/21 × 108
= 5.14
∴ The mean deviation is 5.14