Calculate mean, variation and standard deviation of the following frequency distribution:
| Classes | Frequency |
| 1-10 | 11 |
| 10-20 | 29 |
| 20-30 | 18 |
| 30-40 | 4 |
| 40-50 | 5 |
| 50-60 | 3 |
1
18.98, 259.68, 15.3
2
21.08, 158.68, 12.6
3
36.3, 469.25, 30.6
4
11.52, 145.32, 9.3
Calculate mean, variation and standard deviation of the following frequency distribution:
| Classes | Frequency |
| 1-10 | 11 |
| 10-20 | 29 |
| 20-30 | 18 |
| 30-40 | 4 |
| 40-50 | 5 |
| 50-60 | 3 |