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 the …

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

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

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 indicates that the …

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 …

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.

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.

Dec 26, 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 variation and shows how …

What is Standard Deviation? Standard deviation is the degree of dispersion or the scatter of the data points relative to its mean, in descriptive statistics. It tells how the values are spread across the data …

Standard deviation (SD) is a measure of the amount of variation in a set of values. A low SD—close to zero—indicates that the values tend to be close to the mean of the set, while a high SD indicates that …