The standard deviation of a random variable, sample, statistical population, data set, or probability distribution is the square root of its variance. (For a finite population, variance is the average of …

This free standard deviation calculator computes the standard deviation, variance, mean, sum, and error margin of a given data set.

Deviation just means how far from the normal. The Standard Deviation is a measure of how spreadout numbers are.

Jan 2, 2025 · Standard deviation is a statistical measure that shows how much a group of data is spread out or dispersed from its mean value (average). A smaller standard deviation value …

Sep 17, 2020 · The standard deviation is the average amount of variability in your dataset. It tells you, on average, how far each score lies from the mean.

Aug 26, 2025 · To calculate standard deviation, start by calculating the mean, or average, of your data set. Then, subtract the mean from all of the numbers in your data set, and square each of …

The standard deviation (SD) is a single number that summarizes the variability in a dataset. It represents the typical distance between each data point and the mean.

Nov 4, 2025 · Standard deviation is a measure used in statistics to understand how the data points in a set are spread out from the mean value. It indicates the extent of the data's …

Standard deviation is a statistical measure of variability that indicates the average amount that a set of numbers deviates from their mean. The higher the standard deviation, the more spread …

Jun 4, 2025 · Standard deviation is a statistical measurement that looks at how far discrete points in a dataset are dispersed from the mean of that set. It is calculated as the square root of the …