1. Department of Statistics and Operations Research, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia
2. Department of Mathematics and Statistics, College of Science Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia
3. The Higher Institute of Commercial Sciences, Al Mahalla Al Kubra 31951, Algharbia, Egypt