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9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    Following table shows the weights of 12 students
    Weight (in kgs)      67 70 72 73 75
    Number of students     4 3 2 2 1
    The mean weight is

    A) 70.36                          

    B) 70.89

    C) 70.25                

    D) None of these

    Correct Answer: C

    Solution :

    From the given table,
    x f \[{{x}_{i}}{{f}_{i}}\]
    67 4 268
    70 3 210
    72 2 144
    73 2 146
    75 1 75
    n = 12 \[\sum{{{x}_{i}}{{f}_{i}}=843}\]
    \[N=\sum{{{f}_{i}}}=12\] Mean weight\[=\frac{\sum{{{x}_{i}}{{f}_{i}}}}{N}=\frac{843}{12}=70.25.\]


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