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    Question

    The mean of 10 observations is 8. One more observation

    is added, and the new mean becomes 9. What is the value of the 11th observation?
    A 24 Correct Answer Incorrect Answer
    B 19 Correct Answer Incorrect Answer
    C 26 Correct Answer Incorrect Answer
    D 41 Correct Answer Incorrect Answer

    Solution

    The mean of 10 observations=18 Total =10├Ч8=80 After including the new observations =10+1=11 New mean =11 Then total=11├Ч9=99 13th observations =99-80 =19.

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