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JEE Main & Advanced Mathematics Statistics Question Bank Mean

  • question_answer
    \[{{d}_{i}}\] is the deviation of a class mark \[{{y}_{i}}\] from ?a? the assumed mean and \[{{f}_{i}}\] is the frequency, if \[{{M}_{g}}=x+\frac{1}{\sum {{f}_{i}}}(\sum {{f}_{i}}{{d}_{i}})\], then x is

    A)                 Lower limit            

    B)                 Assumed mean

    C)                 Number of observations        

    D)                 Class size

    Correct Answer: B

    Solution :

                    \[{{M}_{g}}=a+\frac{1}{\Sigma {{f}_{i}}}(\Sigma {{f}_{i}}{{d}_{i}})\];  \\[x=a\] i.e., x = assumed mean.


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