1. Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
2. Department of Mathematics, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
3. Department of Statistics, Quaid-i-Azam University, Islamabad, Pakistan
4. Foundation Foundation University Medical College, Foundation University School of Health Sciences Islamabad, DHA-I Islamabad 44000, Pakistan
5. Department of Statistics, University of Peshawar, Peshawar, Pakistan
6. Department of Statistics, University of Wah, Wah Cantt, Pakistan
7. Department of Biology, Yazd University, P. O. Box 89175-741, Yazd, Iran