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10th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    The mean of 20 observations is\[12.5\]. By error, one observation was noted as \[-15\]instead of 15. Then the correct mean is

    A)  \[11.75\]                     

    B)  11                  

    C)  14                              

    D)  13

    Correct Answer: C

    Solution :

    The incorrect sum of observations \[=12.5\times 20=250\] Now, correct sum \[=250-(-15)+15=280\] \[\therefore \] Correct mean  \[=\frac{280}{20}=14\]


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