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.
1 Variance is how spread out your data is from the mean or mathematical average. 2  Standard deviation is a figure that represents how spread out your data is in your sample.  In our sample of tree heights, the variance was 0.55.