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

  • question_answer
    The mean of five numbers is 30. If one number is excluded, their mean becomes 28. The excluded number is

    A) 28

    B) 30

    C) 35

    D) 38

    Correct Answer: D

    Solution :

    [d] Mean of 5 numbers = 30 \[\therefore \] Total sum of 5 numbers \[=30\times 5=150\] After excluded one number Mean of 4 number will be = 28 \[\therefore \]Total sum of 4 numbers \[=4\times 28=112\] Thus, excluded number = (sum of 5 numbers - sum of 4 numbers) \[=150-112=38\]


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