Dr. Manar El-Sheikh Abdelrahman, Department of Statistics, Faculty of Mathematical Sciences,  University of Khartoum

P.O. Box 321   Khartoum, Sudan

Email: manar@uofk.edu

Ustaz Abdelaziz Tangsawi, Department of Statistics, Faculty of Mathematical Sciences,  University of Khartoum

P.O. Box 321  Khartoum, Sudan

Email: atangasawi@uofk.edu

Dr. Mohsin Hashim, Department of Statistics, Faculty of Mathematical Sciences, University of Khartoum

P.O. Box 321   Khartoum, Sudan

Email: mhashim@uofk.edu