Аннотация:Descriptive ability, interpretation of the parameters and properties of the asymmetric probability density Aexp(-(x-c)^2/(a(x-c)+2b^2)) are presented as intermediate case between normal and exponential distributions. Into frame of central limit theorem it is proved the distribution approximate sum of n random variables with accuracy as 1/n, refinement approximations of 4-th order are presented. General and some specific properties of the distribution are base of methods using of the distribution. Appropriate formulae and table are presented for practical using. Relationship with exponential and normal distributions makes usage of the distribution to be convenient.