1. Department of Statistics, Yazd University, P.O. Box 89175-741, Yazd, Iran
2. PIDE School of Economics, Islamabad 44000, Pakistan
3. Mathematics Department, Al-Qunfudah University College, Umm Al-Qura University, Mecca, KSA
4. Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
5. Department of Mathematics, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
6. Department of Mathematics, Faculty of science, Zarqa university, Zarqa, Jordan
7. Department of Mathematics, Faculty of Science, Al al-Bayt University, Mafraq, Jordan