Full text search :

variance

The square of the standard deviation, usually denoted by Ïƒ{TAG(tag=>sup)}2{TAG}. The variance of a discrete random variable X is âˆ‘{TAG(tag=>sub)}x{TAG} (x -Î¼){TAG(tag=>sup)}2{TAG}P(X = x), where Î¼ is its mean and P(X = x) is the probability that X takes the value x; the variance of a continuous random variable is âˆ«(x - Î¼){TAG(tag=>sup)}2{TAG}f(x) dx, whereÎ¼ is its mean and f(x) is its probability density function.

Bookmark this page:

<< former term		next term >>
variable star		variation