What is the meaning of Samona? How popular is the baby name Samona? Learn the origin and popularity plus how to pronounce Samona
Variance. Variance (Ï 2) is a measure of the dispersion of a set of data points around their mean value. In other words, variance is a mathematical expectation of the average squared deviations from the mean. It is computed by finding the probability-weighted average of squared deviations from the expected value. Variance measures the variability from an average (volatility).
The standard deviation calculation tells you how spread out the numbers are in your sample. To figure this out for your sample or data set, you will need to perform a few calculations first. You will need to find the mean and variance of your data before you can find the standard deviation.Variance is a measure of how far your data is clustered around the mean. Standard deviation is found by taking the square root of the variance of your sample.ather all of your data. You will need every number in your sample to calculate the mean. 1  The mean is the average of all your data points. 2  This is calculated by adding all of the numbers in your sample, then dividing this figure by the how many numbers there are in your sample (n).