1. Department of Mathematics and Statistics, College of Science, Imam Mohammad Ibn Saud Islamic University, Saudi Arabia
2. Department of Basic Sciences Higher Institute of Administrative Sciences, Osim, Egypt
3. School of Science, Engineering, and Environment, Salford University, Great Manchester, UK
4. Diyala University, Baqubah, Diyala, Iraq
5. Department of Statistics and Insurance, Faculty of Commerce, Zagazig University, Egypt