1. Department of Nature Science, Community College of Riyadh, King Saud University, PO Box 28095, Riyadh 11437, Saudi Arabia (Corresponding author), e-mail: a_shafay2013@yahoo.com, https://orcid.org/0000-0003-2348-1161
2. Department of Mathematics, Fayoum University, Fayoum 63514, Egypt
3. Department of Statistics and Operations Research, College of Science, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
4. Department of Mathematics, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt