mean of 25 observation 18.the mean of first 12 of them is 14 and last 12 is 17.find the 13th result

Question

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Answer 1

Mean=18 for 25 observations, so total of 18×25=450.

Sum of first 12 observations=12×14=168.

Sum of last 12 observations=12×17=204.

If x₁₃ is the 13th datum, then 168+x₁₃+204=450, x₁₃=450-372=78.