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      Question

      The mean of 12 observations is 15. One more observation

      is included and the new mean becomes 16. The 13th observation is
      A 20 Correct Answer Incorrect Answer
      B 24 Correct Answer Incorrect Answer
      C 26 Correct Answer Incorrect Answer
      D 28 Correct Answer Incorrect Answer

      Solution

      The mean of 12 observations=15 Total =15Γ—12=180 After including the new observations =12+1=13 New mean =16 Then total=16Γ—13=208 13th observations =208-180=28.Β 

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