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9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    The average monthly income of a four member family is Rs. 610.25. After the marriage of one girl and her leaving the family, the average income of the family becomes Rs. 650.75. Then the salary of the married, girl was

    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 \[=Rs.\,610.25\times 4=Rs.\,2441.00\] The income of the family without the girl \[=Rs.\,650.75\times 3=1952.25\] Hence the salary of married girl \[=Rs.\,2441.00-Rs.\,1952.25=Rs.\,488.75\]


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