1. Department of Mathematics and Statistics, University of Energy and Natural Resources, Sunyani, Ghana
2. Department of Statistics and Actuarial Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
3. Department of Statistics, The Islamia University of Bahawalpur, Bahawalpur, Pakistan
4. Department of Statistics, Shaheed Benazir Bhutto University, Shaheed Benazirabad, Pakistan