Standard deviation is a statistic measuring the dispersion of a dataset relative to its mean. It is calculated as the square root of the variance. Learn how it's used.

The formula for pooled standard deviation In the formula above, n is the sample size of the group, S squared the group ...

How to calculate Standard Deviation in Excel. The Standard Deviation is a term used in statistics. The term describes how much the numbers if a set of data vary from the mean. The syntax to ...

The normal distribution formula is based on two simple parameters—mean and standard deviation—that quantify the characteristics of a given dataset.