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

  • question_answer
    The mean of 20 observations is 15. On checking, it was found that two observations were wrongly copied as 3 and 6. If wrong observations are replaced by correct values 8 and 4, then the correct mean is

    A) 15

    B) 15.15

    C) 15.35

    D) 16

    Correct Answer: B

    Solution :

    [b] Sum of all observations \[=20\times 15=300\] Sum of correct observations \[=300-(3+6)+(8+4)=303\] Correct mean \[=\frac{303}{20}=15.15\]


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