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9th Class Mathematics Probability Question Bank Probability

  • question_answer
    400 students of class IX of a school appeared for a test of 100 marks in the subject of mathematics and the data about the marks secured is presented in the table.
    Marks secured 0-25 26-50 51-75 Above 75
    Number of student   50 220 100 30
    If the result card of a student is picked up at random, what is the probability that the student has secured more than 50 marks?

    A)  0.523                                   

    B)         0.532                   

    C)         0.325                                   

    D)         0.352

    Correct Answer: C

    Solution :

    Total number of students who appeared for the test = 400 Number of students who scored more than 50 marks \[=100+30=130\] \[\therefore \]The required probability \[=\frac{130}{400}=\frac{13}{40}=\frac{1.3}{4}=0.325\]


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