1. Department of Mathematics, Guizhou University, Guiyang 550025, China
2. Institute of Actuarial Science and Data Analytics, UCSI University, Cheers 56000, Malaysia
3. Department of Basic Sciences, FSD Campus, UET Lahore, Lahore, Pakistan
4. Faculty of Science, Yibin University, Yibin 644000, China
5. Eastern Africa Statistical Training Center, Dar es Salaam, Tanzania