Analyze data sets by finding the mean and variance.
Standard deviation σ = sqrt( Σ(x − mean)² / N ); variance is the square of the standard deviation.
For the set 2, 4, 4, 4, 5, 5, 7, 9 the standard deviation is about 2.
It measures how spread out the values in a data set are around the mean. A larger value means more variation.
A sample divides by N−1, a population by N. Use the sample version when your data is a sample of a larger group.
Enter numbers separated by commas or spaces; the calculator computes mean, variance, and standard deviation.