In our life there are many distribution that can be used to model life time data. However there are many important problem in which the real data cannot fit any of the previous life time distributions . Wherefore this works deals with new two flexible distributions, which are (the Weibull - Exponentiated Exponential and the Rayleigh_ Exponentiated Exponential) , by finding the cumulative probability and probability density functions of the two distributions and discussion some of statistical and mathematical properties of each moments , variances , the coefficient of skewness , the generating...