Abstract
World Health Organization announced Coronavirus as a global epidemic virus, and the search for approximating uncertain concepts and measuring the accuracy of the approximation is an important goal for researchers in many theoretical and applied fields. Therefore this paper suggested a specific mathematical approach with the support of the confidence and strength of an association to determine the most important attribute. Our approach is based on removing redundant attributes to produce the successfully reduced set and formulate the core set of attributes. Additionally, we give new insight into the attribute reduction application and in order to get the result, we use MATLAB programming. We want you to know that this research paper lasted more than two months, in order to confirm the results reached.