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 (Ï2), is defined as the sum of the squared distances of each term in the distribution from the mean (Î¼), divided by the number of terms in the distribution (N). There's a more efficient way to calculate the standard deviation for a group of numbers, shown in the following equation: