# Given data points are #28, 30, 29, 26, 31# and #30#, find standard deviation step by step?

##### 1 Answer

Oct 25, 2017

Standard Deviation is

#### Explanation:

**Arithmetic Mean** is simply **sum of all data points divided by their number** and as here data points are

**Deviations from mean** are **values of data points minus arithmetc mean** and here they are

Squares of the deviations are

As **variance is average of square of the deviations** , variance is

and **Standard Deviation is square root of variance** i.e.