# How to Calculate Standard Deviation?

How to Calculate Standard Deviation of a Sample and a Population?

## SD Calculation

Standard deviation, also known as SD is used to measure how much the data are spread out. It is represented by the symbol Î£. It is used to quantify the amount of dispersion of given values. In other words, it is the square of the variance.

**Formula :**

Standard deviation can be calculated for sample and population using two different formulas :

**SD of Sample = **âˆšÎ£ (X -M) ^{2} / (n - 1)

**SD of Population =**âˆšÎ£ (X -M)^{2}/ n

Where,

X = Elements

M = Mean

n = Number of Elements

Learn how to find standard deviation (SD) of a sample and population using the below tutorials :

How to Find SD of a Sample?

How to Find Standard Deviation of a Population ?

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