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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