1. Department of Statistics and Operations Research, King Saud University, Riyadh, Saudi Arabia
2. Department of Mathematics and Statistics, Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia
3. Department of Statistics, Central University of Haryana, Mahendergarh, India
4. Natural Science Department, Community College of Riyadh, King Saud University, Riyadh, Saudi Arabia
5. Department of Mathematics, Faculty of Science, Fayoum University, Fayoum, Egypt