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JEE Main & Advanced Mathematics Statistics Question Bank Self Evaluation Test - Statistics

  • question_answer
    The mean income of a group of 50 persons was calculated as Rs. 169. Later it was discovered that one figure was wrongly taken as 134 instead of correct value 143. The correct mean should be (in Rs.)

    A) 168

    B) 169

    C) 168.92

    D) 169.18

    Correct Answer: D

    Solution :

    [d] Given, \[169=\frac{\Sigma x}{50}\] Correct value is 143. Hence, sum is short by 9. \[\therefore M=\frac{169\times 50+9}{50}=169+\frac{9}{50}=169.18\]


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