1. Department of Statistics and Operations Research, College of Science, King Saud University, Riyadh, Saudi Arabia
2. Higher Education Department, Deputy Secretary, Lahore, Pakistan
3. Government Associate College, Khairpur Tamewali, Bahawalpur, Pakistan
4. Department of Mathematics, Faculty of Science, Tanta University, Tanta, Egypt
5. School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne, U.K
6. Faculty of Science and Humanities, School of Postgraduate Studies and Research (SPGSR), Amoud University, Borama, Somalia