1. Department of Statistics, Quaid-i-Azam University, Islamabad, Pakistan
2. Department of Statistics, Federal Urdu University of Arts, Science and Technology Islamabad, Islamabad, Pakistan
3. Department of Mathematics, College of Sciences and Arts (Muhyil), King Khalid University, Muhyil 61421, Saudi Arabia
4. Department of Mathematics and Computer, College of Sciences, Ibb University, Ibb 70270, Yemen
5. College of Statistical and Actuarial Sciences, University of the Punjab, Lahore, Pakistan
6. Mathematics Department, College of Humanities and Science, Prince Sattam Bin Abdulaziz University, Al Aflaj, Saudi Arabia
7. Administration Department, Administrative Science College, Thamar University, Thamar, Yemen