Anxiety can often make these related conditions worse, so talk with a mental health care professional if anxiety begins to interfere on a daily basis.
In probability theory and statistics, the variance of a random variable is a measure of its statistical dispersion, indicating how far from the expected value its values typically are. The variance of a real-valued random variable is its second central moment, and it also happens to be its second cumulant.
The variance is a measure of the variability of dispersion of the data. It is given by calculating and squaring the differences between the values and the mean, and calculating the average (mean) of those values. - How far, on average, each observation is from the mean.