In probability theory and statistics or variance somehow sensing, scattering.

the amount of with the average of the square distance of the amount of probable or observed with the expected amount calculated. In comparison with the average can be said that the mean, the distribution shows, while scale that indicates that the data around the average of how the plays have been. less in the sense that it is expected that if a sample of the distribution shall be selected its value to the average of the close. square quantity initial. The root of the second that the standard deviation is called has a unit identical with the variable early.