Standard Deviation Calculator
Calculate the standard deviation, variance and mean of a list of numbers, for a sample or a whole population.
- Count
- 8
- Mean
- 5
- Sample standard deviation (s)
- 2.13808994
- Population standard deviation (ฯ)
- 2
- Sample variance
- 4.57142857
- Population variance
- 4
- Sum
- 40
- Smallest and largest
- 2 and 9
What is Standard Deviation Calculator?
Standard deviation measures how spread out numbers are around their average. A small value means they are close together and a large value means they are far apart.
What this tool does
Takes a list of numbers and shows the count, the mean, the sample and population standard deviation, the variances, the sum and the smallest and largest values.
How to use it
- Paste or type your numbers.
- Read the results.
- Use the sample values if your numbers are part of a larger group, and the population values if they are all of it.
Did you know?
- The sample version divides by n minus 1, which corrects for the fact that a sample tends to understate the spread.
- In a normal distribution about 68 percent of values lie within one standard deviation of the mean.