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    Question

    The meaning of 12 observations is 15. One more

    observation is included, and the new mean becomes 17. The 13th observation is.
    A 20 Correct Answer Incorrect Answer
    B 41 Correct Answer Incorrect Answer
    C 24 Correct Answer Incorrect Answer
    D 26 Correct Answer Incorrect Answer

    Solution

    The mean of 12 observations=15 Total =15×12=180 After including the new observations =12+1=13 New mean =17 Then total=17×13=221 13th observations =221-180=41.

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