1. Department of Statistics, Faculty of Commerce, Zagazig University 1 , Zagazig 44519, Egypt
2. Department of Mathematical Sciences, College of Science, Princess Nourah bint Abdulrahman University 2 , P.O. Box 84428, Riyadh 11671, Saudi Arabia
3. 3 Mathematics Department, Faculty of Sciences, Umm Al-Qura University, Makkah, Saudi Arabia