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 of a set of samples that is represented by random variable X is its second central moment, the expected value of the squared deviation from the mean Î¼ = E[X] : This definition encompasses random variables that are generated by processes that are discrete, continuous, neither, or mixed.