Kayid, M.

Department of Statistics and Operations Research, College of Science, King Saud Univ., Riyadh, SA Department of Mathematics and Computer Science, Faculty of Science, Suez Univ., Suez, EG

Elbatal, I.

Institute of Statistical Studies and Research, Department of Mathematical Statistics, Cairo Univ., Giza, EG

Merovci, F.

Department of Mathematics, Univ. of Prishtina “Hasan Prishtina,”, Republic of Kosovo, Prishtinë, XK