1. Applied Statistics and Insurance Department, Faculty of Commerce, Mansoura University, Mansoura, Egypt
2. Statistics Department, Faculty of Business Administration, Delta University of Science and Technology, Mansoura, Egypt
3. Statistics Department, University of Tabuk, Tabuk, Saudi Arabia
4. Mathematics Department, Faculty of Science, Helwan University, Cairo, Egypt
5. Mathematical and Natural Sciences Department, Faculty of Engineering, Egyptian Russian University, Badr, Egypt