1. Department of Statistics, Abdul Wali Khan University, Mardan, Pakistan
2. Department of Statistics, Quaid-i-Azam University, Islamabad, Pakistan
3. Department of Statistics, University of Wah, Wah Cantt, Pakistan
4. Department of Applied Mathematics and Statistics, Institute of Space Technology, Islamabad, Pakistan
5. Department of Mathematics, College of Science and Arts, Qassim University, Ar Rass, Saudi Arabia