1. Department of Statistics, Faculty of Commerce, Zagazig University, Zagazig, Egypt
2. Department of Statistics, Faculty of Business Administration, Delta University of Science and Technology, Gamasa, Egypt
3. Department of Mathematics, College of Science & Arts, King Abdulaziz University, P.O. Box 344, Rabigh 21911, Saudi Arabia
4. Department of Mathematics & Statistics, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
5. Pan African University, Institute of Basic Science, Technology and Innovation (PAUSTI), Nairobi 6200-00200, Kenya