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.
In a population, variance is the average squared deviation from the population mean, as defined by the following formula: Ï 2 = Î£ ( X i - Î¼ ) 2 / N where Ï 2 is the population variance, Î¼ is the population mean, X i is the ith element from the population, and N is the number of elements in the population.