1. Department of Mathematics, Faculty of Science, Helwan University, Cairo 11795, Egypt
2. Department of Statistics, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia
3. Faculty of Business Administration, Delta University of Science and Technology, Gamasa 11152, Egypt
4. Faculty of Graduate Studies for Statistical Research, Cairo University, Giza 12613, Egypt
5. Mathematics Department, College of Science, Jouf University, P.O. Box 2014, Sakaka, Saudi Arabia
6. Department of Mathematics, Faculty of Science, Tanta University, Tanta 31527, Egypt
7. Department of Mathematics, Faculty of Science, Minia University, Minia 61519, Egypt