The fomula for standard deviation is as below:

And the sample standard deviation is calculated as:

**n** is the number of samples

**x** is the mean value of the samples

**x _{i}** is the value of the i

^{th}sample

The fomula for standard deviation is as below:

And the sample standard deviation is calculated as:

**n** is the number of samples

**x** is the mean value of the samples

**x _{i}** is the value of the i