defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Statistics Variance and Standard Deviation
Let a1, a2, ….. a10 be 10 observations such that \(\sum_{k=1}^{10} a_k=50 \) and \( \sum_{\forall k. Then the standard deviation of a1, a2, ….. a10 is equal to:
1
5
2
√5
3
10
4
√110