1. School of Statistics, Shanxi University of Finance and Economics, Taiyuan, China
2. Department of Statistics, Quaid-i-Azam University, Islamabad, Pakistan
3. Department of Management Sciences, University of Swabi, Swabi, Pakistan
4. Department of Administrative Sciences and Humanities, Collage of Community at Buraydah, Qassim University, Buraydah 51452, Saudi Arabia
5. Department of Statistics, Abdul Wali Khan University, Mardan, Pakistan