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Q 3043145943.     `400` students of class X of a school appeared in a test of `100` marks in the subject of social studies and the data about the marks secured Is as below :
If the result card of a student he picked up at random, what is the probability that the student has secured more than 50 marks.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)