defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Statistics Variance and Standard Deviation
If the standard deviation of n elements of the series x1, x2, x3 ....... , xn is σ, then find the variance of the series ax1, ax2, ax3 ....... , axn is:
1
a2σ
2
a2nσ
3
aσ
4
a2σ2