1. College of Science and Humanities, Shaqra University, Shaqra, Saudi Arabia
2. Department of Mathematics, College of Science and Arts, Qassim University, Ar Rass, Saudi Arabia
3. Central Agency for Public Mobilization & Statistics (CAPMAS), Cairo, Egypt
4. Statistics Department, Faculty of Science, King Abdul Aziz University, Jeddah, Saudi Arabia
5. The Higher Institute of Commercial Sciences, Al Mahalla Al Kubra, Algarbia 31951, Egypt