railway RRB Technician Grade 1 Mock Test 2024 Mathematics Statistics Variance and Standard Deviation
Standard deviation for the following distribution is:
| Size of Item | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Frequency | 3 | 6 | 9 | 13 | 8 | 5 | 4 |
1
1.6
2
9.0
3
5.0
4
1.88
Standard deviation for the following distribution is:
| Size of Item | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Frequency | 3 | 6 | 9 | 13 | 8 | 5 | 4 |