Standard Deviation Calculator
Calculate mean, variance, and standard deviation for a set of 5 values.
The Standard Deviation Calculator measures the amount of variation or dispersion in a dataset. Enter five values and get the mean, variance, population standard deviation, and sample standard deviation.
Standard deviation tells you how spread out the values are from the mean. A low standard deviation means values cluster near the mean, while a high standard deviation means they are spread over a wider range.
Population standard deviation divides by N, while sample standard deviation divides by N-1 (Bessel's correction) to provide an unbiased estimate when working with a sample rather than the entire population.
Frequently Asked Questions
What is standard deviation?
Standard deviation is a measure of how spread out numbers are from their average. It is the square root of the variance.
When should I use population vs sample standard deviation?
Use population standard deviation when you have data for the entire group. Use sample standard deviation when your data is a sample from a larger population.
What does a high standard deviation mean?
A high standard deviation indicates that values are widely spread from the mean, showing high variability in the dataset.