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7th Class Mathematics Data Handling Question Bank Data Handling & Graphs

  • question_answer
    The mean of 8 numbers is 10. If one number is excluded, mean of the remaining numbers becomes9, then the excluded number is

    A)  16                              

    B)  9            

    C)  8                                

    D)  17

    Correct Answer: D

    Solution :

    (d): \[{{x}_{1}}+...........{{x}_{8}}=8\times 10=80\] Sum of seven nos. \[=7\times 9=63\] \[\therefore \]  excluded no \[=80-60=17\]


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