railway RRB Technician Grade 1 Mock Test 2024 Mathematics Statistics Variance and Standard Deviation
The variance of the following frequency distribution is
| Classes | 0 -10 | 10 - 20 | 20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 |
| Frequency | 11 | 29 | 18 | 4 | 5 | 3 |
1
165.3
2
161.1
3
282.1
4
152.5