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10th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    What is the value of 'n' if the mean of first 9 natural numbers is\[\frac{5n}{9}\]?

    A) 7                                             

    B) 8

    C) 9                             

    D)        11

    Correct Answer: C

    Solution :

    Mean of first 9 natural numbers \[=\frac{1+2+.....+9}{9}=\frac{45}{9}=5\] Given mean of first 9 natural numbers is\[\frac{5n}{9}\]. \[\Rightarrow \]\[\frac{5n}{9}=5\]           \[\Rightarrow \]               \[n=\frac{9\times 5}{5}=9\]


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