1. Department of Mathematics, College of Science, University of Al-Qadisiyah, Al Diwaniyah 13236, Al-Qadisiyah, Iraq
2. Medical Physics Department, College of Science, University of Al-Qadisiyah, Al Diwaniyah 13236, Al-Qadisiyah, Iraq
3. Department of Statistics-Forecast-Mathematics, Faculty of Economics and Business Administration, Babeş-Bolyai University, 400083 Cluj-Napoca, Romania