1. Department of Statistics, Faculty of Science, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia
2. Department of Statistics, Faculty of Commerce, Zagazig University, Zagazig, Egypt
3. Department of Statistics, St. Anthony’s College, Shillong, Meghalaya, India
4. School of Mathematics, Yunnan Normal University, Kunming, P.R. China
5. Faculty of Technology and Development, Zagazig University, Zagazig, Egypt