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.
Definition: Variance can be defined as the difference between the budgeted or expected cost or income for an activity and the actual costs or income for the activity. In standard costing and budget control, variance constitutes the difference between the budgeted costs and the actual costs for an activity.