Question

The following data represents the number of blogs that a sample of students state they follow. 12,3,10,9,0,1,8,7,3,10,19

Calculate the standard deviation

Answer 1

Standard Deviation, σ: 5.2805584478028

Explanation:

Count, N: 11

Sum, Σx: 82

Mean, μ: 7.4545454545455

Variance, σ2: 27.884297520661

Steps

σ =radical 1/N Σ(xi - μ)squared (N i=1)

σ2= (12 - 7.4545454545455)2 + ... + (19 - 7.4545454545455)2/ 11

= 306.72727272727/ 11

= 27.884297520661

σ = √27.884297520661

= 5.2805584478028