1. Department of Mathematics and Statistics, College of Science, Imam Mohammad Ibn Saud Islamic University, Riyadh 11564, Saudi Arabia
2. Department of Basic Sciences, Higher Institute of Administrative Sciences, Belbeis 44621, Egypt
3. School of Science, Engineering and Environment, Salford University, Salford M5 4WT, UK
4. College of Veterinary Medicine, Diyala University, Baquba 32001, Iraq
5. Department of Statistics and Insurance, Faculty of Commerce, Zagazig University, Zagazig 44519, Egypt