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9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    The average monthly income of a four members family is Rs.610.25, after the marriage of one girl the average income of the family becomes Rs.650.75, then the salary of married girl is

    A) Rs.488.25                   

    B) Rs.488.75

    C) Rs.479.75                   

    D) Rs.489.25

    Correct Answer: B

    Solution :

    The total income of the family with the girl \[=Rs.650.75\times 3=Rs.2441.00\] The income of the family without the girl \[=Rs.650.75\times 3=Rs.1952.25\] Hence, the salary of married girl \[=Rs.2441.00-Rs.1952.25=Rs.488.75\]


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