1. Department of Statistics, Mathematics & Insurance, Faculty of Commerce, Benha University, Benha, Egypt
2. Departamento de Matemática Aplicadae Estatística, Universidade de São Paulo, São Carlos, São Paulo, Brazil
3. Department of Applied Mathematics, Northwestern Polytechnical University, Xi’an, China
4. Department of Statistics, Faculty of Science, King Abdulaziz University, Jeddah, Kingdom of Saudia Arabia
5. Department of Statistics, Faculty of Commerce, Zagazig University, Zagazig, Egypt