railway RRB Technician Grade 1 Mock Test 2024 Mathematics Statistics Variance and Standard Deviation
The variance of the following frequency distribution is
| Class Interval | 0-6 | 6-12 | 12-18 | 18-24 | 24-30 |
| Frequency | 10 | 8 | 6 | 4 | 2 |
1
56
2
30
3
11
4
20
The variance of the following frequency distribution is
| Class Interval | 0-6 | 6-12 | 12-18 | 18-24 | 24-30 |
| Frequency | 10 | 8 | 6 | 4 | 2 |