defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Statistics Variance and Standard Deviation
यदि \(\sum_{i=1}^{18}(x_i\ -\ 8)\ =\ 3\) और \(\sum_{i=1}^{18}(x_i\ -\ 8)^2\ =\ 45\) हो तो x1, x2, x3 ...x18 का मानक विचलन कितना है?
1
\(\frac{3}{2}\)
2
\(\sqrt{{\frac{89}{36}}}\)
3
\(\frac{5}{2}\)
4
√5