Returns the variance of a degenerate distribution.
constant value of distribution
variance
var v = variance( 0.1 ); // returns 0.0
var v = variance( 0.5 ); // returns 0.0
var v = variance( 10.0 ); // returns 0.0
var v = variance( NaN ); // returns NaN
Returns the variance of a degenerate distribution.