For a certain distribution if ∑(x−2)=18,∑(x−24)=0,∑(x−28)=−24) then arithmetic mean is_______________?
Correct answer: B. 24
- A. 21
- B. 24
- C. 28
- D. 0
Explanation
Because ∑(x − 24) = 0, 24 is the arithmetic mean, using the property that deviations from the mean sum to zero. The other supplied sums are consistent with the same mean when the number of observations is positive.
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